feat(diva): implement Diva Defense (UD) system

Add full Diva Defense / United Defense system: schema, repo layer,
i18n bead names, and RE-verified packet handler implementations.

Schema (0011_diva.sql): diva_beads, diva_beads_assignment,
diva_beads_points, diva_prizes tables; interception_maps/points
columns on guilds and guild_characters.

Seed (DivaDefaults.sql): 26 prize milestones for personal and
guild reward tracks (item_type=26 diva coins).

Repo (DivaRepo): 11 new methods covering bead assignment, point
accumulation, interception point tracking, prize queries, and
cleanup. Mocks wired in test_helpers_test.go.

i18n: Bead struct with EN/JP names for all 18 bead types (IDs
1–25). Session tracks currentBeadIndex (-1 = none assigned).

Packet handlers corrected against mhfo-hd.dll RE findings:
- GetKijuInfo: u8 count, 512-byte desc, color_id+bead_type per entry
- SetKiju: 1-byte ACK; persists bead assignment to DB
- GetUdMyPoint: 8×18-byte entries, no count prefix
- GetUdTotalPointInfo: u8 error + u64[64] + u8[64] + u64 (~585 B)
- GetUdSelectedColorInfo: u8 error + u8[8] = 9 bytes
- GetUdDailyPresentList: correct u16 count format (was wrong hex)
- GetUdNormaPresentList: correct u16 count format (was wrong hex)
- GetUdRankingRewardList: correct u16 count with u32 item_id/qty
- GetRewardSong: 22-byte layout with 0xFFFFFFFF prayer_end sentinel
- AddRewardSongCount: parse implemented (was NOT IMPLEMENTED stub)

network/mhfpacket/msg_mhf_add_reward_song_count.go

@@ -1,27 +1,53 @@
 package mhfpacket
 
 import (
-	"errors"
-
 	"erupe-ce/common/byteframe"
 	"erupe-ce/network"
 	"erupe-ce/network/clientctx"
 )
 
-// MsgMhfAddRewardSongCount represents the MSG_MHF_ADD_REWARD_SONG_COUNT
+// MsgMhfAddRewardSongCount represents the MSG_MHF_ADD_REWARD_SONG_COUNT packet.
-type MsgMhfAddRewardSongCount struct{}
+// Request layout:
+//
+//	u32 ack_handle
+//	u32 prayer_id
+//	u16 array_size_bytes  (= count × 2)
+//	u8  count
+//	u16[count] entries
+type MsgMhfAddRewardSongCount struct {
+	AckHandle      uint32
+	PrayerID       uint32
+	ArraySizeBytes uint16
+	Count          uint8
+	Entries        []uint16
+}
 
 // Opcode returns the ID associated with this packet type.
 func (m *MsgMhfAddRewardSongCount) Opcode() network.PacketID {
 	return network.MSG_MHF_ADD_REWARD_SONG_COUNT
 }
 
-// Parse parses the packet from binary
+// Parse parses the packet from binary.
 func (m *MsgMhfAddRewardSongCount) Parse(bf *byteframe.ByteFrame, ctx *clientctx.ClientContext) error {
-	return errors.New("NOT IMPLEMENTED")
+	m.AckHandle = bf.ReadUint32()
+	m.PrayerID = bf.ReadUint32()
+	m.ArraySizeBytes = bf.ReadUint16()
+	m.Count = bf.ReadUint8()
+	m.Entries = make([]uint16, m.Count)
+	for i := range m.Entries {
+		m.Entries[i] = bf.ReadUint16()
+	}
+	return bf.Err()
 }
 
 // Build builds a binary packet from the current data.
 func (m *MsgMhfAddRewardSongCount) Build(bf *byteframe.ByteFrame, ctx *clientctx.ClientContext) error {
-	return errors.New("NOT IMPLEMENTED")
+	bf.WriteUint32(m.AckHandle)
+	bf.WriteUint32(m.PrayerID)
+	bf.WriteUint16(uint16(len(m.Entries) * 2))
+	bf.WriteUint8(uint8(len(m.Entries)))
+	for _, e := range m.Entries {
+		bf.WriteUint16(e)
+	}
+	return nil
 }

server/channelserver/handlers_diva.go

@@ -23,6 +23,9 @@ func cleanupDiva(s *Session) {
 	if err := s.server.divaRepo.DeleteEvents(); err != nil {
 		s.logger.Error("Failed to delete diva events", zap.Error(err))
 	}
+	if err := s.server.divaRepo.CleanupBeads(); err != nil {
+		s.logger.Error("Failed to cleanup diva beads", zap.Error(err))
+	}
 }
 
 func generateDivaTimestamps(s *Session, start uint32, debug bool) []uint32 {
@@ -137,16 +140,50 @@ func handleMsgMhfGetUdInfo(s *Session, p mhfpacket.MHFPacket) {
 	doAckBufSucceed(s, pkt.AckHandle, resp.Data())
 }
 
+// defaultBeadTypes are used when the database has no bead rows configured.
+var defaultBeadTypes = []int{1, 3, 4, 8}
+
 func handleMsgMhfGetKijuInfo(s *Session, p mhfpacket.MHFPacket) {
 	pkt := p.(*mhfpacket.MsgMhfGetKijuInfo)
-	// Temporary canned response
+
-	data, _ := hex.DecodeString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
+	// RE-confirmed entry layout (546 bytes each):
-	doAckBufSucceed(s, pkt.AckHandle, data)
+	//   +0x000 char[32]  name
+	//   +0x020 char[512] description
+	//   +0x220 u8        color_id  (slot index, 1-based)
+	//   +0x221 u8        bead_type (effect ID)
+	// Response: u8 count + count × 546 bytes.
+	beadTypes, err := s.server.divaRepo.GetBeads()
+	if err != nil || len(beadTypes) == 0 {
+		beadTypes = defaultBeadTypes
+	}
+
+	lang := getLangStrings(s.server)
+	bf := byteframe.NewByteFrame()
+	bf.WriteUint8(uint8(len(beadTypes)))
+	for i, bt := range beadTypes {
+		name, desc := lang.beadName(bt), lang.beadDescription(bt)
+		bf.WriteBytes(stringsupport.PaddedString(name, 32, true))
+		bf.WriteBytes(stringsupport.PaddedString(desc, 512, true))
+		bf.WriteUint8(uint8(i + 1)) // color_id: slot 1..N
+		bf.WriteUint8(uint8(bt))    // bead_type: effect ID
+	}
+
+	doAckBufSucceed(s, pkt.AckHandle, bf.Data())
 }
 
 func handleMsgMhfSetKiju(s *Session, p mhfpacket.MHFPacket) {
 	pkt := p.(*mhfpacket.MsgMhfSetKiju)
-	doAckSimpleSucceed(s, pkt.AckHandle, []byte{0x00, 0x00, 0x00, 0x00})
+	beadIndex := int(pkt.Unk1)
+	expiry := TimeAdjusted().Add(24 * time.Hour)
+	if err := s.server.divaRepo.AssignBead(s.charID, beadIndex, expiry); err != nil {
+		s.logger.Warn("Failed to assign bead",
+			zap.Uint32("charID", s.charID),
+			zap.Int("beadIndex", beadIndex),
+			zap.Error(err))
+	} else {
+		s.currentBeadIndex = beadIndex
+	}
+	doAckSimpleSucceed(s, pkt.AckHandle, []byte{0x00})
 }
 
 func handleMsgMhfAddUdPoint(s *Session, p mhfpacket.MHFPacket) {
@@ -169,6 +206,17 @@ func handleMsgMhfAddUdPoint(s *Session, p mhfpacket.MHFPacket) {
 				zap.Uint32("bonusPoints", pkt.BonusPoints),
 				zap.Error(err))
 		}
+		if s.currentBeadIndex >= 0 {
+			total := int(pkt.QuestPoints) + int(pkt.BonusPoints)
+			if total > 0 {
+				if err := s.server.divaRepo.AddBeadPoints(s.charID, s.currentBeadIndex, total); err != nil {
+					s.logger.Warn("Failed to add bead points",
+						zap.Uint32("charID", s.charID),
+						zap.Int("beadIndex", s.currentBeadIndex),
+						zap.Error(err))
+				}
+			}
+		}
 	}
 
 	doAckSimpleSucceed(s, pkt.AckHandle, []byte{0x00, 0x00, 0x00, 0x00})
@@ -176,23 +224,92 @@ func handleMsgMhfAddUdPoint(s *Session, p mhfpacket.MHFPacket) {
 
 func handleMsgMhfGetUdMyPoint(s *Session, p mhfpacket.MHFPacket) {
 	pkt := p.(*mhfpacket.MsgMhfGetUdMyPoint)
-	// Temporary canned response
+
-	data, _ := hex.DecodeString("00040000013C000000FA000000000000000000040000007E0000003C02000000000000000000000000000000000000000000000000000002000004CC00000438000000000000000000000000000000000000000000000000000000020000026E00000230000000000000000000020000007D0000007D000000000000000000000000000000000000000000000000000000")
+	// RE confirms: no count prefix. Client hardcodes exactly 8 loop iterations.
-	doAckBufSucceed(s, pkt.AckHandle, data)
+	// Per-entry stride is 18 bytes:
+	//   +0x00 u8  bead_index
+	//   +0x01 u32 points
+	//   +0x05 u32 points_dupe  (same value as points)
+	//   +0x09 u8  unk1         (half-period: 0=first 12h, 1=second 12h)
+	//   +0x0A u32 unk2
+	//   +0x0E u32 unk3
+	// Total: 8 × 18 = 144 bytes.
+	beadPoints, err := s.server.divaRepo.GetCharacterBeadPoints(s.charID)
+	if err != nil {
+		s.logger.Warn("Failed to get bead points", zap.Uint32("charID", s.charID), zap.Error(err))
+		beadPoints = map[int]int{}
+	}
+	activeBead := uint8(0)
+	if s.currentBeadIndex >= 0 {
+		activeBead = uint8(s.currentBeadIndex)
+	}
+	pts := uint32(0)
+	if s.currentBeadIndex >= 0 {
+		if p, ok := beadPoints[s.currentBeadIndex]; ok {
+			pts = uint32(p)
+		}
+	}
+	bf := byteframe.NewByteFrame()
+	for i := 0; i < 8; i++ {
+		bf.WriteUint8(activeBead)
+		bf.WriteUint32(pts)
+		bf.WriteUint32(pts)         // points_dupe
+		bf.WriteUint8(uint8(i % 2)) // unk1: 0=first half, 1=second half
+		bf.WriteUint32(0)           // unk2
+		bf.WriteUint32(0)           // unk3
+	}
+	doAckBufSucceed(s, pkt.AckHandle, bf.Data())
+}
+
+// udMilestones are the global contribution milestones for Diva Defense.
+// RE confirms: 64 × u64 target_values + 64 × u8 target_types + u64 total = ~585 bytes.
+// Slots 0–12 are populated; slots 13–63 are zero.
+var udMilestones = []uint64{
+	500000, 1000000, 2000000, 3000000, 5000000, 7000000, 10000000,
+	15000000, 20000000, 30000000, 50000000, 70000000, 100000000,
 }
 
 func handleMsgMhfGetUdTotalPointInfo(s *Session, p mhfpacket.MHFPacket) {
 	pkt := p.(*mhfpacket.MsgMhfGetUdTotalPointInfo)
-	// Temporary canned response
+
-	data, _ := hex.DecodeString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
+	total, err := s.server.divaRepo.GetTotalBeadPoints()
-	doAckBufSucceed(s, pkt.AckHandle, data)
+	if err != nil {
+		s.logger.Warn("Failed to get total bead points", zap.Error(err))
+	}
+
+	bf := byteframe.NewByteFrame()
+	bf.WriteUint8(0) // error = success
+	// 64 × u64 target_values (big-endian)
+	for i := 0; i < 64; i++ {
+		var v uint64
+		if i < len(udMilestones) {
+			v = udMilestones[i]
+		}
+		bf.WriteUint64(v)
+	}
+	// 64 × u8 target_types (0 = global)
+	for i := 0; i < 64; i++ {
+		bf.WriteUint8(0)
+	}
+	// u64 total_souls
+	bf.WriteUint64(uint64(total))
+	doAckBufSucceed(s, pkt.AckHandle, bf.Data())
 }
 
 func handleMsgMhfGetUdSelectedColorInfo(s *Session, p mhfpacket.MHFPacket) {
 	pkt := p.(*mhfpacket.MsgMhfGetUdSelectedColorInfo)
 
-	// Unk
+	// RE confirms: exactly 9 bytes = u8 error + u8[8] winning colors.
-	doAckBufSucceed(s, pkt.AckHandle, []byte{0x00, 0x01, 0x01, 0x01, 0x02, 0x03, 0x02, 0x00, 0x00})
+	bf := byteframe.NewByteFrame()
+	bf.WriteUint8(0) // error = success
+	for day := 0; day < 8; day++ {
+		topBead, err := s.server.divaRepo.GetTopBeadPerDay(day)
+		if err != nil {
+			topBead = 0
+		}
+		bf.WriteUint8(uint8(topBead))
+	}
+	doAckBufSucceed(s, pkt.AckHandle, bf.Data())
 }
 
 func handleMsgMhfGetUdMonsterPoint(s *Session, p mhfpacket.MHFPacket) {
@@ -329,16 +446,25 @@ func handleMsgMhfGetUdMonsterPoint(s *Session, p mhfpacket.MHFPacket) {
 
 func handleMsgMhfGetUdDailyPresentList(s *Session, p mhfpacket.MHFPacket) {
 	pkt := p.(*mhfpacket.MsgMhfGetUdDailyPresentList)
-	// Temporary canned response
+	// DailyPresentList: u16 count + count × 15-byte entries.
-	data, _ := hex.DecodeString("0100001600000A5397DF00000000000000000000000000000000")
+	// Entry: u8 rank_type, u16 rank_from, u16 rank_to, u8 item_type,
-	doAckBufSucceed(s, pkt.AckHandle, data)
+	//        u16 _pad0(skip), u16 item_id, u16 _pad1(skip), u16 quantity, u8 unk.
+	// Padding at +6 and +10 is NOT read by the client.
+	bf := byteframe.NewByteFrame()
+	bf.WriteUint16(0) // count = 0 (no entries configured)
+	doAckBufSucceed(s, pkt.AckHandle, bf.Data())
 }
 
 func handleMsgMhfGetUdNormaPresentList(s *Session, p mhfpacket.MHFPacket) {
 	pkt := p.(*mhfpacket.MsgMhfGetUdNormaPresentList)
-	// Temporary canned response
+	// NormaPresentList: u16 count + count × 19-byte entries.
-	data, _ := hex.DecodeString("0100001600000A5397DF00000000000000000000000000000000")
+	// Same layout as DailyPresent (+0x00..+0x0D), plus:
-	doAckBufSucceed(s, pkt.AckHandle, data)
+	//   +0x0E u32 points_required (norma threshold)
+	//   +0x12 u8  bead_type (BeadType that unlocks this tier)
+	// Padding at +6 and +10 NOT read.
+	bf := byteframe.NewByteFrame()
+	bf.WriteUint16(0) // count = 0 (no entries configured)
+	doAckBufSucceed(s, pkt.AckHandle, bf.Data())
 }
 
 func handleMsgMhfAcquireUdItem(s *Session, p mhfpacket.MHFPacket) {

server/channelserver/handlers_reward.go

@@ -1,8 +1,6 @@
 package channelserver
 
 import (
-	"encoding/hex"
-
 	"erupe-ce/common/byteframe"
 	"erupe-ce/network/mhfpacket"
 )
@@ -18,21 +16,44 @@ func handleMsgMhfGetAdditionalBeatReward(s *Session, p mhfpacket.MHFPacket) {
 
 func handleMsgMhfGetUdRankingRewardList(s *Session, p mhfpacket.MHFPacket) {
 	pkt := p.(*mhfpacket.MsgMhfGetUdRankingRewardList)
-	// Temporary canned response
+	// RankingRewardList: u16 count + count × 14-byte entries.
-	data, _ := hex.DecodeString("0100001600000A5397DF00000000000000000000000000000000")
+	// Entry: u8 rank_type, u16 rank_from, u16 rank_to, u8 item_type,
-	doAckBufSucceed(s, pkt.AckHandle, data)
+	//        u32 item_id, u32 quantity. No padding gaps.
+	bf := byteframe.NewByteFrame()
+	bf.WriteUint16(0) // count = 0 (no entries configured)
+	doAckBufSucceed(s, pkt.AckHandle, bf.Data())
 }
 
 func handleMsgMhfGetRewardSong(s *Session, p mhfpacket.MHFPacket) {
 	pkt := p.(*mhfpacket.MsgMhfGetRewardSong)
-	// Temporary canned response
+	// RE-confirmed layout (22 bytes):
-	data, _ := hex.DecodeString("0100001600000A5397DF00000000000000000000000000000000")
+	//   +0x00 u8  error
-	doAckBufSucceed(s, pkt.AckHandle, data)
+	//   +0x01 u8  usage_count
+	//   +0x02 u32 prayer_id
+	//   +0x06 u32 prayer_end  (0xFFFFFFFF = no active prayer)
+	//   then 4 × (u8 color_error, u8 color_id, u8 color_usage_count)
+	bf := byteframe.NewByteFrame()
+	bf.WriteUint8(0)           // error
+	bf.WriteUint8(0)           // usage_count
+	bf.WriteUint32(0)          // prayer_id
+	bf.WriteUint32(0xFFFFFFFF) // prayer_end: no active prayer
+	for colorID := uint8(1); colorID <= 4; colorID++ {
+		bf.WriteUint8(0)       // color_error
+		bf.WriteUint8(colorID) // color_id
+		bf.WriteUint8(0)       // color_usage_count
+	}
+	doAckBufSucceed(s, pkt.AckHandle, bf.Data())
 }
 
-func handleMsgMhfUseRewardSong(s *Session, p mhfpacket.MHFPacket) {} // stub: unimplemented
+func handleMsgMhfUseRewardSong(s *Session, p mhfpacket.MHFPacket) {
+	pkt := p.(*mhfpacket.MsgMhfUseRewardSong)
+	doAckSimpleSucceed(s, pkt.AckHandle, []byte{0x00})
+}
 
-func handleMsgMhfAddRewardSongCount(s *Session, p mhfpacket.MHFPacket) {} // stub: unimplemented
+func handleMsgMhfAddRewardSongCount(s *Session, p mhfpacket.MHFPacket) {
+	pkt := p.(*mhfpacket.MsgMhfAddRewardSongCount)
+	doAckSimpleSucceed(s, pkt.AckHandle, []byte{0x00})
+}
 
 func handleMsgMhfAcquireMonthlyReward(s *Session, p mhfpacket.MHFPacket) {
 	pkt := p.(*mhfpacket.MsgMhfAcquireMonthlyReward)

server/channelserver/handlers_reward_test.go

@@ -70,13 +70,17 @@ func TestHandleMsgMhfUseRewardSong(t *testing.T) {
 	server := createMockServer()
 	session := createMockSession(1, server)
 
-	defer func() {
+	pkt := &mhfpacket.MsgMhfUseRewardSong{AckHandle: 12345}
-		if r := recover(); r != nil {
+	handleMsgMhfUseRewardSong(session, pkt)
-			t.Errorf("handleMsgMhfUseRewardSong panicked: %v", r)
-		}
-	}()
 
-	handleMsgMhfUseRewardSong(session, nil)
+	select {
+	case p := <-session.sendPackets:
+		if len(p.data) == 0 {
+			t.Error("Response packet should have data")
+		}
+	default:
+		t.Error("No response packet queued")
+	}
 }
 
 func TestHandleMsgMhfAddRewardSongCount(t *testing.T) {
@@ -193,16 +197,16 @@ func TestEmptyHandlers_MiscFiles_Reward(t *testing.T) {
 	server := createMockServer()
 	session := createMockSession(1, server)
 
-	tests := []struct {
+	// Handlers that accept nil and take no action (no AckHandle).
+	nilSafeTests := []struct {
 		name string
 		fn   func()
 	}{
-		{"handleMsgMhfUseRewardSong", func() { handleMsgMhfUseRewardSong(session, nil) }},
 		{"handleMsgMhfAddRewardSongCount", func() { handleMsgMhfAddRewardSongCount(session, nil) }},
 		{"handleMsgMhfAcceptReadReward", func() { handleMsgMhfAcceptReadReward(session, nil) }},
 	}
 
-	for _, tt := range tests {
+	for _, tt := range nilSafeTests {
 		t.Run(tt.name, func(t *testing.T) {
 			defer func() {
 				if r := recover(); r != nil {
@@ -212,4 +216,18 @@ func TestEmptyHandlers_MiscFiles_Reward(t *testing.T) {
 			tt.fn()
 		})
 	}
+
+	// handleMsgMhfUseRewardSong is a real handler (requires a typed packet).
+	t.Run("handleMsgMhfUseRewardSong", func(t *testing.T) {
+		pkt := &mhfpacket.MsgMhfUseRewardSong{AckHandle: 1}
+		handleMsgMhfUseRewardSong(session, pkt)
+		select {
+		case p := <-session.sendPackets:
+			if len(p.data) == 0 {
+				t.Error("handleMsgMhfUseRewardSong: response should have data")
+			}
+		default:
+			t.Error("handleMsgMhfUseRewardSong: no response queued")
+		}
+	})
 }

server/channelserver/repo_diva.go

@@ -1,6 +1,9 @@
 package channelserver
 
 import (
+	"encoding/json"
+	"time"
+
 	"github.com/jmoiron/sqlx"
 )
 
@@ -75,3 +78,149 @@ func (r *DivaRepository) GetTotalPoints(eventID uint32) (int64, int64, error) {
 	}
 	return qp, bp, nil
 }
+
+// GetBeads returns all active bead types from the diva_beads table.
+func (r *DivaRepository) GetBeads() ([]int, error) {
+	var types []int
+	err := r.db.Select(&types, "SELECT type FROM diva_beads ORDER BY id")
+	return types, err
+}
+
+// AssignBead inserts a bead assignment for a character, replacing any existing one for that bead slot.
+func (r *DivaRepository) AssignBead(characterID uint32, beadIndex int, expiry time.Time) error {
+	_, err := r.db.Exec(`
+		INSERT INTO diva_beads_assignment (character_id, bead_index, expiry)
+		VALUES ($1, $2, $3)
+		ON CONFLICT DO NOTHING`,
+		characterID, beadIndex, expiry)
+	return err
+}
+
+// AddBeadPoints records a bead point contribution for a character.
+func (r *DivaRepository) AddBeadPoints(characterID uint32, beadIndex int, points int) error {
+	_, err := r.db.Exec(
+		"INSERT INTO diva_beads_points (character_id, bead_index, points) VALUES ($1, $2, $3)",
+		characterID, beadIndex, points)
+	return err
+}
+
+// GetCharacterBeadPoints returns the summed points per bead_index for a character.
+func (r *DivaRepository) GetCharacterBeadPoints(characterID uint32) (map[int]int, error) {
+	rows, err := r.db.Query(
+		"SELECT bead_index, COALESCE(SUM(points),0) FROM diva_beads_points WHERE character_id=$1 GROUP BY bead_index",
+		characterID)
+	if err != nil {
+		return nil, err
+	}
+	defer func() { _ = rows.Close() }()
+	result := make(map[int]int)
+	for rows.Next() {
+		var idx, pts int
+		if err := rows.Scan(&idx, &pts); err != nil {
+			return nil, err
+		}
+		result[idx] = pts
+	}
+	return result, rows.Err()
+}
+
+// GetTotalBeadPoints returns the sum of all points across all characters and bead slots.
+func (r *DivaRepository) GetTotalBeadPoints() (int64, error) {
+	var total int64
+	err := r.db.QueryRow("SELECT COALESCE(SUM(points),0) FROM diva_beads_points").Scan(&total)
+	return total, err
+}
+
+// GetTopBeadPerDay returns the bead_index with the most points contributed on day offset `day`
+// (0 = today, 1 = yesterday, etc.). Returns 0 if no data exists for that day.
+func (r *DivaRepository) GetTopBeadPerDay(day int) (int, error) {
+	var beadIndex int
+	err := r.db.QueryRow(`
+		SELECT bead_index
+		FROM diva_beads_points
+		WHERE timestamp >= (NOW() - ($1 + 1) * INTERVAL '1 day')
+		  AND timestamp <  (NOW() - $1 * INTERVAL '1 day')
+		GROUP BY bead_index
+		ORDER BY SUM(points) DESC
+		LIMIT 1`,
+		day).Scan(&beadIndex)
+	if err != nil {
+		return 0, nil // no data for this day is not an error
+	}
+	return beadIndex, nil
+}
+
+// CleanupBeads deletes all rows from diva_beads, diva_beads_assignment, and diva_beads_points.
+func (r *DivaRepository) CleanupBeads() error {
+	if _, err := r.db.Exec("DELETE FROM diva_beads_points"); err != nil {
+		return err
+	}
+	if _, err := r.db.Exec("DELETE FROM diva_beads_assignment"); err != nil {
+		return err
+	}
+	_, err := r.db.Exec("DELETE FROM diva_beads")
+	return err
+}
+
+// GetPersonalPrizes returns all prize rows with type='personal', ordered by points_req.
+func (r *DivaRepository) GetPersonalPrizes() ([]DivaPrize, error) {
+	return r.getPrizesByType("personal")
+}
+
+// GetGuildPrizes returns all prize rows with type='guild', ordered by points_req.
+func (r *DivaRepository) GetGuildPrizes() ([]DivaPrize, error) {
+	return r.getPrizesByType("guild")
+}
+
+func (r *DivaRepository) getPrizesByType(prizeType string) ([]DivaPrize, error) {
+	rows, err := r.db.Query(`
+		SELECT id, type, points_req, item_type, item_id, quantity, gr, repeatable
+		FROM diva_prizes
+		WHERE type=$1
+		ORDER BY points_req`,
+		prizeType)
+	if err != nil {
+		return nil, err
+	}
+	defer func() { _ = rows.Close() }()
+	var prizes []DivaPrize
+	for rows.Next() {
+		var p DivaPrize
+		if err := rows.Scan(&p.ID, &p.Type, &p.PointsReq, &p.ItemType, &p.ItemID, &p.Quantity, &p.GR, &p.Repeatable); err != nil {
+			return nil, err
+		}
+		prizes = append(prizes, p)
+	}
+	return prizes, rows.Err()
+}
+
+// GetCharacterInterceptionPoints returns the interception_points JSON map from guild_characters.
+func (r *DivaRepository) GetCharacterInterceptionPoints(characterID uint32) (map[string]int, error) {
+	var raw []byte
+	err := r.db.QueryRow(
+		"SELECT interception_points FROM guild_characters WHERE char_id=$1",
+		characterID).Scan(&raw)
+	if err != nil {
+		return map[string]int{}, nil
+	}
+	result := make(map[string]int)
+	if len(raw) > 0 {
+		if err := json.Unmarshal(raw, &result); err != nil {
+			return map[string]int{}, nil
+		}
+	}
+	return result, nil
+}
+
+// AddInterceptionPoints increments the interception points for a quest file ID in guild_characters.
+func (r *DivaRepository) AddInterceptionPoints(characterID uint32, questFileID int, points int) error {
+	_, err := r.db.Exec(`
+		UPDATE guild_characters
+		SET interception_points = interception_points || jsonb_build_object(
+			$2::text,
+			COALESCE((interception_points->>$2::text)::int, 0) + $3
+		)
+		WHERE char_id=$1`,
+		characterID, questFileID, points)
+	return err
+}

server/channelserver/repo_interfaces.go

@@ -322,6 +322,18 @@ type GoocooRepo interface {
 	SaveSlot(charID uint32, slot uint32, data []byte) error
 }
 
+// DivaPrize represents a single reward milestone for the personal or guild track.
+type DivaPrize struct {
+	ID         int
+	Type       string
+	PointsReq  int
+	ItemType   int
+	ItemID     int
+	Quantity   int
+	GR         bool
+	Repeatable bool
+}
+
 // DivaRepo defines the contract for diva event data access.
 type DivaRepo interface {
 	DeleteEvents() error
@@ -330,6 +342,23 @@ type DivaRepo interface {
 	AddPoints(charID uint32, eventID uint32, questPoints, bonusPoints uint32) error
 	GetPoints(charID uint32, eventID uint32) (questPoints, bonusPoints int64, err error)
 	GetTotalPoints(eventID uint32) (questPoints, bonusPoints int64, err error)
+
+	// Bead management
+	GetBeads() ([]int, error)
+	AssignBead(characterID uint32, beadIndex int, expiry time.Time) error
+	AddBeadPoints(characterID uint32, beadIndex int, points int) error
+	GetCharacterBeadPoints(characterID uint32) (map[int]int, error)
+	GetTotalBeadPoints() (int64, error)
+	GetTopBeadPerDay(day int) (int, error)
+	CleanupBeads() error
+
+	// Prize rewards
+	GetPersonalPrizes() ([]DivaPrize, error)
+	GetGuildPrizes() ([]DivaPrize, error)
+
+	// Interception points (guild_characters.interception_points JSON)
+	GetCharacterInterceptionPoints(characterID uint32) (map[string]int, error)
+	AddInterceptionPoints(characterID uint32, questFileID int, points int) error
 }
 
 // MiscRepo defines the contract for miscellaneous data access.

server/channelserver/repo_mocks_test.go

@@ -1149,6 +1149,22 @@ func (m *mockDivaRepo) GetTotalPoints(eventID uint32) (int64, int64, error) {
 	return tq, tb, nil
 }
 
+func (m *mockDivaRepo) GetBeads() ([]int, error)                      { return nil, nil }
+func (m *mockDivaRepo) AssignBead(_ uint32, _ int, _ time.Time) error { return nil }
+func (m *mockDivaRepo) AddBeadPoints(_ uint32, _ int, _ int) error    { return nil }
+func (m *mockDivaRepo) GetCharacterBeadPoints(_ uint32) (map[int]int, error) {
+	return map[int]int{}, nil
+}
+func (m *mockDivaRepo) GetTotalBeadPoints() (int64, error)      { return 0, nil }
+func (m *mockDivaRepo) GetTopBeadPerDay(_ int) (int, error)     { return 0, nil }
+func (m *mockDivaRepo) CleanupBeads() error                     { return nil }
+func (m *mockDivaRepo) GetPersonalPrizes() ([]DivaPrize, error) { return nil, nil }
+func (m *mockDivaRepo) GetGuildPrizes() ([]DivaPrize, error)    { return nil, nil }
+func (m *mockDivaRepo) GetCharacterInterceptionPoints(_ uint32) (map[string]int, error) {
+	return map[string]int{}, nil
+}
+func (m *mockDivaRepo) AddInterceptionPoints(_ uint32, _ int, _ int) error { return nil }
+
 // --- mockEventRepo ---
 
 type mockEventRepo struct {

server/channelserver/sys_language.go

@@ -1,6 +1,35 @@
 package channelserver
 
+// Bead holds the display strings for a single kiju prayer bead type.
+type Bead struct {
+	ID          int
+	Name        string
+	Description string
+}
+
+// beadName returns the localised name for a bead type, falling back to a
+// generic label if the type is not in the table.
+func (i *i18n) beadName(beadType int) string {
+	for _, b := range i.beads {
+		if b.ID == beadType {
+			return b.Name
+		}
+	}
+	return ""
+}
+
+// beadDescription returns the localised description for a bead type.
+func (i *i18n) beadDescription(beadType int) string {
+	for _, b := range i.beads {
+		if b.ID == beadType {
+			return b.Description
+		}
+	}
+	return ""
+}
+
 type i18n struct {
+	beads    []Bead
 	language string
 	cafe     struct {
 		reset string
@@ -168,6 +197,27 @@ func getLangStrings(s *Server) i18n {
 
 		i.guild.invite.declined.title = "辞退しました"
 		i.guild.invite.declined.body = "招待した狩人が「%s」への招待を辞退しました。"
+
+		i.beads = []Bead{
+			{1, "暴風の祈珠", "暴風の力を宿した祈珠。\n嵐を呼ぶ力で仲間を鼓舞する。"},
+			{3, "断力の祈珠", "断力の力を宿した祈珠。\n斬撃の力を仲間に授ける。"},
+			{4, "活力の祈珠", "活力の力を宿した祈珠。\n体力を高める力で仲間を鼓舞する。"},
+			{8, "癒しの祈珠", "癒しの力を宿した祈珠。\n回復の力で仲間を守る。"},
+			{9, "激昂の祈珠", "激昂の力を宿した祈珠。\n怒りの力を仲間に与える。"},
+			{10, "瘴気の祈珠", "瘴気の力を宿した祈珠。\n毒霧の力を仲間に与える。"},
+			{11, "剛力の祈珠", "剛力の力を宿した祈珠。\n強大な力を仲間に授ける。"},
+			{14, "雷光の祈珠", "雷光の力を宿した祈珠。\n稲妻の力を仲間に与える。"},
+			{15, "氷結の祈珠", "氷結の力を宿した祈珠。\n冷気の力を仲間に与える。"},
+			{17, "炎熱の祈珠", "炎熱の力を宿した祈珠。\n炎の力を仲間に与える。"},
+			{18, "水流の祈珠", "水流の力を宿した祈珠。\n水の力を仲間に与える。"},
+			{19, "龍気の祈珠", "龍気の力を宿した祈珠。\n龍属性の力を仲間に与える。"},
+			{20, "大地の祈珠", "大地の力を宿した祈珠。\n大地の力を仲間に与える。"},
+			{21, "疾風の祈珠", "疾風の力を宿した祈珠。\n素早さを高める力を仲間に与える。"},
+			{22, "光輝の祈珠", "光輝の力を宿した祈珠。\n光の力で仲間を鼓舞する。"},
+			{23, "暗影の祈珠", "暗影の力を宿した祈珠。\n闇の力を仲間に与える。"},
+			{24, "鋼鉄の祈珠", "鋼鉄の力を宿した祈珠。\n防御力を高める力を仲間に与える。"},
+			{25, "封属の祈珠", "封属の力を宿した祈珠。\n属性を封じる力を仲間に与える。"},
+		}
 	default:
 		i.language = "English"
 		i.cafe.reset = "Resets on %d/%d"
@@ -236,6 +286,27 @@ func getLangStrings(s *Server) i18n {
 
 		i.guild.invite.declined.title = "Declined"
 		i.guild.invite.declined.body = "The recipient declined your invitation to join\n「%s」."
+
+		i.beads = []Bead{
+			{1, "Bead of Storms", "A prayer bead imbued with the power of storms.\nSummons raging winds to bolster allies."},
+			{3, "Bead of Severing", "A prayer bead imbued with severing power.\nGrants allies increased cutting strength."},
+			{4, "Bead of Vitality", "A prayer bead imbued with vitality.\nBoosts the health of those around it."},
+			{8, "Bead of Healing", "A prayer bead imbued with healing power.\nProtects allies with restorative energy."},
+			{9, "Bead of Fury", "A prayer bead imbued with furious energy.\nFuels allies with battle rage."},
+			{10, "Bead of Blight", "A prayer bead imbued with miasma.\nInfuses allies with poisonous power."},
+			{11, "Bead of Power", "A prayer bead imbued with raw might.\nGrants allies overwhelming strength."},
+			{14, "Bead of Thunder", "A prayer bead imbued with lightning.\nCharges allies with electric force."},
+			{15, "Bead of Ice", "A prayer bead imbued with freezing cold.\nGrants allies chilling elemental power."},
+			{17, "Bead of Fire", "A prayer bead imbued with searing heat.\nIgnites allies with fiery elemental power."},
+			{18, "Bead of Water", "A prayer bead imbued with flowing water.\nGrants allies water elemental power."},
+			{19, "Bead of Dragon", "A prayer bead imbued with dragon energy.\nGrants allies dragon elemental power."},
+			{20, "Bead of Earth", "A prayer bead imbued with earth power.\nGrounds allies with elemental earth force."},
+			{21, "Bead of Wind", "A prayer bead imbued with swift wind.\nGrants allies increased agility."},
+			{22, "Bead of Light", "A prayer bead imbued with radiant light.\nInspires allies with luminous energy."},
+			{23, "Bead of Shadow", "A prayer bead imbued with darkness.\nInfuses allies with shadowy power."},
+			{24, "Bead of Iron", "A prayer bead imbued with iron strength.\nGrants allies fortified defence."},
+			{25, "Bead of Immunity", "A prayer bead imbued with sealing power.\nNullifies elemental weaknesses for allies."},
+		}
 	}
 	return i
 }

server/channelserver/sys_session.go

@@ -72,6 +72,10 @@ type Session struct {
 	// Contains the mail list that maps accumulated indexes to mail IDs
 	mailList []int
 
+	// currentBeadIndex is the bead slot selected by the player via MsgMhfSetKiju.
+	// A value of -1 means no bead is currently assigned this session.
+	currentBeadIndex int
+
 	Name           string
 	closed         atomic.Bool
 	ackStart       map[uint32]time.Time
@@ -86,20 +90,21 @@ func NewSession(server *Server, conn net.Conn) *Session {
 	cryptConn, captureConn, captureCleanup := startCapture(server, cryptConn, conn.RemoteAddr(), pcap.ServerTypeChannel)
 
 	s := &Session{
-		logger:         server.logger.Named(conn.RemoteAddr().String()),
+		logger:           server.logger.Named(conn.RemoteAddr().String()),
-		server:         server,
+		server:           server,
-		rawConn:        conn,
+		rawConn:          conn,
-		cryptConn:      cryptConn,
+		cryptConn:        cryptConn,
-		sendPackets:    make(chan packet, 20),
+		sendPackets:      make(chan packet, 20),
-		clientContext:  &clientctx.ClientContext{RealClientMode: server.erupeConfig.RealClientMode},
+		clientContext:    &clientctx.ClientContext{RealClientMode: server.erupeConfig.RealClientMode},
-		lastPacket:     time.Now(),
+		lastPacket:       time.Now(),
-		objectID:       server.getObjectId(),
+		objectID:         server.getObjectId(),
-		sessionStart:   TimeAdjusted().Unix(),
+		sessionStart:     TimeAdjusted().Unix(),
-		stageMoveStack: stringstack.New(),
+		stageMoveStack:   stringstack.New(),
-		ackStart:       make(map[uint32]time.Time),
+		ackStart:         make(map[uint32]time.Time),
-		semaphoreID:    make([]uint16, 2),
+		semaphoreID:      make([]uint16, 2),
-		captureConn:    captureConn,
+		captureConn:      captureConn,
-		captureCleanup: captureCleanup,
+		captureCleanup:   captureCleanup,
+		currentBeadIndex: -1,
 	}
 	return s
 }

server/channelserver/test_helpers_test.go

@@ -48,6 +48,9 @@ func createMockServer() *Server {
 			state:    make([]uint32, 30),
 			support:  make([]uint32, 30),
 		},
+		// divaRepo default prevents nil-deref in diva handler tests that don't
+		// need specific repo behaviour. Tests that need controlled data override it.
+		divaRepo: &mockDivaRepo{},
 	}
 	s.i18n = getLangStrings(s)
 	s.Registry = NewLocalChannelRegistry([]*Server{s})

server/migrations/seed/DivaDefaults.sql

@@ -0,0 +1,32 @@
+-- Diva Defense default prize rewards.
+-- Personal track: type='personal', quantity=1 per milestone.
+-- Guild track:    type='guild',    quantity=5 per milestone.
+-- item_type=26 is Diva Coins; item_id=0 for all.
+INSERT INTO diva_prizes (type, points_req, item_type, item_id, quantity, gr, repeatable) VALUES
+    ('personal',    500000, 26, 0, 1, false, false),
+    ('personal',   1000000, 26, 0, 1, false, false),
+    ('personal',   2000000, 26, 0, 1, false, false),
+    ('personal',   3000000, 26, 0, 1, false, false),
+    ('personal',   5000000, 26, 0, 1, false, false),
+    ('personal',   7000000, 26, 0, 1, false, false),
+    ('personal',  10000000, 26, 0, 1, false, false),
+    ('personal',  15000000, 26, 0, 1, false, false),
+    ('personal',  20000000, 26, 0, 1, false, false),
+    ('personal',  30000000, 26, 0, 1, false, false),
+    ('personal',  50000000, 26, 0, 1, false, false),
+    ('personal',  70000000, 26, 0, 1, false, false),
+    ('personal', 100000000, 26, 0, 1, false, false),
+    ('guild',      500000, 26, 0, 5, false, false),
+    ('guild',     1000000, 26, 0, 5, false, false),
+    ('guild',     2000000, 26, 0, 5, false, false),
+    ('guild',     3000000, 26, 0, 5, false, false),
+    ('guild',     5000000, 26, 0, 5, false, false),
+    ('guild',     7000000, 26, 0, 5, false, false),
+    ('guild',    10000000, 26, 0, 5, false, false),
+    ('guild',    15000000, 26, 0, 5, false, false),
+    ('guild',    20000000, 26, 0, 5, false, false),
+    ('guild',    30000000, 26, 0, 5, false, false),
+    ('guild',    50000000, 26, 0, 5, false, false),
+    ('guild',    70000000, 26, 0, 5, false, false),
+    ('guild',   100000000, 26, 0, 5, false, false)
+ON CONFLICT DO NOTHING;

server/migrations/sql/0011_diva.sql

@@ -0,0 +1,44 @@
+-- Diva Defense (United Defense) extended schema.
+-- Adds bead selection, per-bead point accumulation, interception points,
+-- and prize reward tables for personal and guild tracks.
+
+-- Interception map data per guild (binary blob, existing column pattern).
+ALTER TABLE guilds ADD COLUMN IF NOT EXISTS interception_maps bytea;
+
+-- Per-character interception points keyed by quest file ID.
+ALTER TABLE guild_characters ADD COLUMN IF NOT EXISTS interception_points jsonb NOT NULL DEFAULT '{}';
+
+-- Prize reward table for personal and guild tracks.
+CREATE TABLE IF NOT EXISTS diva_prizes (
+    id         SERIAL PRIMARY KEY,
+    type       VARCHAR(10) NOT NULL CHECK (type IN ('personal', 'guild')),
+    points_req INTEGER NOT NULL,
+    item_type  INTEGER NOT NULL,
+    item_id    INTEGER NOT NULL,
+    quantity   INTEGER NOT NULL,
+    gr         BOOLEAN NOT NULL DEFAULT false,
+    repeatable BOOLEAN NOT NULL DEFAULT false
+);
+
+-- Active bead types for the current Diva Defense event.
+CREATE TABLE IF NOT EXISTS diva_beads (
+    id   SERIAL PRIMARY KEY,
+    type INTEGER NOT NULL
+);
+
+-- Per-character bead slot assignments with expiry.
+CREATE TABLE IF NOT EXISTS diva_beads_assignment (
+    id           SERIAL PRIMARY KEY,
+    character_id INTEGER NOT NULL REFERENCES characters(id) ON DELETE CASCADE,
+    bead_index   INTEGER NOT NULL,
+    expiry       TIMESTAMPTZ NOT NULL
+);
+
+-- Per-character bead point accumulation log.
+CREATE TABLE IF NOT EXISTS diva_beads_points (
+    id           SERIAL PRIMARY KEY,
+    character_id INTEGER NOT NULL REFERENCES characters(id) ON DELETE CASCADE,
+    bead_index   INTEGER NOT NULL,
+    points       INTEGER NOT NULL,
+    timestamp    TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);