diff --git a/src/generated/main/emu/lunarcore/proto/ReserveStaminaExchangeCsReqOuterClass.java b/src/generated/main/emu/lunarcore/proto/ReserveStaminaExchangeCsReqOuterClass.java
new file mode 100644
index 0000000..1c8b912
--- /dev/null
+++ b/src/generated/main/emu/lunarcore/proto/ReserveStaminaExchangeCsReqOuterClass.java
@@ -0,0 +1,260 @@
+// Code generated by protocol buffer compiler. Do not edit!
+package emu.lunarcore.proto;
+
+import java.io.IOException;
+import us.hebi.quickbuf.FieldName;
+import us.hebi.quickbuf.InvalidProtocolBufferException;
+import us.hebi.quickbuf.JsonSink;
+import us.hebi.quickbuf.JsonSource;
+import us.hebi.quickbuf.MessageFactory;
+import us.hebi.quickbuf.ProtoMessage;
+import us.hebi.quickbuf.ProtoSink;
+import us.hebi.quickbuf.ProtoSource;
+
+public final class ReserveStaminaExchangeCsReqOuterClass {
+  /**
+   * Protobuf type {@code ReserveStaminaExchangeCsReq}
+   */
+  public static final class ReserveStaminaExchangeCsReq extends ProtoMessage<ReserveStaminaExchangeCsReq> implements Cloneable {
+    private static final long serialVersionUID = 0L;
+
+    /**
+     * <code>optional uint32 num = 2;</code>
+     */
+    private int num;
+
+    private ReserveStaminaExchangeCsReq() {
+    }
+
+    /**
+     * @return a new empty instance of {@code ReserveStaminaExchangeCsReq}
+     */
+    public static ReserveStaminaExchangeCsReq newInstance() {
+      return new ReserveStaminaExchangeCsReq();
+    }
+
+    /**
+     * <code>optional uint32 num = 2;</code>
+     * @return whether the num field is set
+     */
+    public boolean hasNum() {
+      return (bitField0_ & 0x00000001) != 0;
+    }
+
+    /**
+     * <code>optional uint32 num = 2;</code>
+     * @return this
+     */
+    public ReserveStaminaExchangeCsReq clearNum() {
+      bitField0_ &= ~0x00000001;
+      num = 0;
+      return this;
+    }
+
+    /**
+     * <code>optional uint32 num = 2;</code>
+     * @return the num
+     */
+    public int getNum() {
+      return num;
+    }
+
+    /**
+     * <code>optional uint32 num = 2;</code>
+     * @param value the num to set
+     * @return this
+     */
+    public ReserveStaminaExchangeCsReq setNum(final int value) {
+      bitField0_ |= 0x00000001;
+      num = value;
+      return this;
+    }
+
+    @Override
+    public ReserveStaminaExchangeCsReq copyFrom(final ReserveStaminaExchangeCsReq other) {
+      cachedSize = other.cachedSize;
+      if ((bitField0_ | other.bitField0_) != 0) {
+        bitField0_ = other.bitField0_;
+        num = other.num;
+      }
+      return this;
+    }
+
+    @Override
+    public ReserveStaminaExchangeCsReq mergeFrom(final ReserveStaminaExchangeCsReq other) {
+      if (other.isEmpty()) {
+        return this;
+      }
+      cachedSize = -1;
+      if (other.hasNum()) {
+        setNum(other.num);
+      }
+      return this;
+    }
+
+    @Override
+    public ReserveStaminaExchangeCsReq clear() {
+      if (isEmpty()) {
+        return this;
+      }
+      cachedSize = -1;
+      bitField0_ = 0;
+      num = 0;
+      return this;
+    }
+
+    @Override
+    public ReserveStaminaExchangeCsReq clearQuick() {
+      if (isEmpty()) {
+        return this;
+      }
+      cachedSize = -1;
+      bitField0_ = 0;
+      return this;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+      if (o == this) {
+        return true;
+      }
+      if (!(o instanceof ReserveStaminaExchangeCsReq)) {
+        return false;
+      }
+      ReserveStaminaExchangeCsReq other = (ReserveStaminaExchangeCsReq) o;
+      return bitField0_ == other.bitField0_
+        && (!hasNum() || num == other.num);
+    }
+
+    @Override
+    public void writeTo(final ProtoSink output) throws IOException {
+      if ((bitField0_ & 0x00000001) != 0) {
+        output.writeRawByte((byte) 16);
+        output.writeUInt32NoTag(num);
+      }
+    }
+
+    @Override
+    protected int computeSerializedSize() {
+      int size = 0;
+      if ((bitField0_ & 0x00000001) != 0) {
+        size += 1 + ProtoSink.computeUInt32SizeNoTag(num);
+      }
+      return size;
+    }
+
+    @Override
+    @SuppressWarnings("fallthrough")
+    public ReserveStaminaExchangeCsReq mergeFrom(final ProtoSource input) throws IOException {
+      // Enabled Fall-Through Optimization (QuickBuffers)
+      int tag = input.readTag();
+      while (true) {
+        switch (tag) {
+          case 16: {
+            // num
+            num = input.readUInt32();
+            bitField0_ |= 0x00000001;
+            tag = input.readTag();
+            if (tag != 0) {
+              break;
+            }
+          }
+          case 0: {
+            return this;
+          }
+          default: {
+            if (!input.skipField(tag)) {
+              return this;
+            }
+            tag = input.readTag();
+            break;
+          }
+        }
+      }
+    }
+
+    @Override
+    public void writeTo(final JsonSink output) throws IOException {
+      output.beginObject();
+      if ((bitField0_ & 0x00000001) != 0) {
+        output.writeUInt32(FieldNames.num, num);
+      }
+      output.endObject();
+    }
+
+    @Override
+    public ReserveStaminaExchangeCsReq mergeFrom(final JsonSource input) throws IOException {
+      if (!input.beginObject()) {
+        return this;
+      }
+      while (!input.isAtEnd()) {
+        switch (input.readFieldHash()) {
+          case 109446: {
+            if (input.isAtField(FieldNames.num)) {
+              if (!input.trySkipNullValue()) {
+                num = input.readUInt32();
+                bitField0_ |= 0x00000001;
+              }
+            } else {
+              input.skipUnknownField();
+            }
+            break;
+          }
+          default: {
+            input.skipUnknownField();
+            break;
+          }
+        }
+      }
+      input.endObject();
+      return this;
+    }
+
+    @Override
+    public ReserveStaminaExchangeCsReq clone() {
+      return new ReserveStaminaExchangeCsReq().copyFrom(this);
+    }
+
+    @Override
+    public boolean isEmpty() {
+      return ((bitField0_) == 0);
+    }
+
+    public static ReserveStaminaExchangeCsReq parseFrom(final byte[] data) throws
+        InvalidProtocolBufferException {
+      return ProtoMessage.mergeFrom(new ReserveStaminaExchangeCsReq(), data).checkInitialized();
+    }
+
+    public static ReserveStaminaExchangeCsReq parseFrom(final ProtoSource input) throws
+        IOException {
+      return ProtoMessage.mergeFrom(new ReserveStaminaExchangeCsReq(), input).checkInitialized();
+    }
+
+    public static ReserveStaminaExchangeCsReq parseFrom(final JsonSource input) throws IOException {
+      return ProtoMessage.mergeFrom(new ReserveStaminaExchangeCsReq(), input).checkInitialized();
+    }
+
+    /**
+     * @return factory for creating ReserveStaminaExchangeCsReq messages
+     */
+    public static MessageFactory<ReserveStaminaExchangeCsReq> getFactory() {
+      return ReserveStaminaExchangeCsReqFactory.INSTANCE;
+    }
+
+    private enum ReserveStaminaExchangeCsReqFactory implements MessageFactory<ReserveStaminaExchangeCsReq> {
+      INSTANCE;
+
+      @Override
+      public ReserveStaminaExchangeCsReq create() {
+        return ReserveStaminaExchangeCsReq.newInstance();
+      }
+    }
+
+    /**
+     * Contains name constants used for serializing JSON
+     */
+    static class FieldNames {
+      static final FieldName num = FieldName.forField("num");
+    }
+  }
+}
diff --git a/src/generated/main/emu/lunarcore/proto/ReserveStaminaExchangeScRspOuterClass.java b/src/generated/main/emu/lunarcore/proto/ReserveStaminaExchangeScRspOuterClass.java
new file mode 100644
index 0000000..8449e99
--- /dev/null
+++ b/src/generated/main/emu/lunarcore/proto/ReserveStaminaExchangeScRspOuterClass.java
@@ -0,0 +1,340 @@
+// Code generated by protocol buffer compiler. Do not edit!
+package emu.lunarcore.proto;
+
+import java.io.IOException;
+import us.hebi.quickbuf.FieldName;
+import us.hebi.quickbuf.InvalidProtocolBufferException;
+import us.hebi.quickbuf.JsonSink;
+import us.hebi.quickbuf.JsonSource;
+import us.hebi.quickbuf.MessageFactory;
+import us.hebi.quickbuf.ProtoMessage;
+import us.hebi.quickbuf.ProtoSink;
+import us.hebi.quickbuf.ProtoSource;
+
+public final class ReserveStaminaExchangeScRspOuterClass {
+  /**
+   * Protobuf type {@code ReserveStaminaExchangeScRsp}
+   */
+  public static final class ReserveStaminaExchangeScRsp extends ProtoMessage<ReserveStaminaExchangeScRsp> implements Cloneable {
+    private static final long serialVersionUID = 0L;
+
+    /**
+     * <code>optional uint32 num = 9;</code>
+     */
+    private int num;
+
+    /**
+     * <code>optional uint32 retcode = 13;</code>
+     */
+    private int retcode;
+
+    private ReserveStaminaExchangeScRsp() {
+    }
+
+    /**
+     * @return a new empty instance of {@code ReserveStaminaExchangeScRsp}
+     */
+    public static ReserveStaminaExchangeScRsp newInstance() {
+      return new ReserveStaminaExchangeScRsp();
+    }
+
+    /**
+     * <code>optional uint32 num = 9;</code>
+     * @return whether the num field is set
+     */
+    public boolean hasNum() {
+      return (bitField0_ & 0x00000001) != 0;
+    }
+
+    /**
+     * <code>optional uint32 num = 9;</code>
+     * @return this
+     */
+    public ReserveStaminaExchangeScRsp clearNum() {
+      bitField0_ &= ~0x00000001;
+      num = 0;
+      return this;
+    }
+
+    /**
+     * <code>optional uint32 num = 9;</code>
+     * @return the num
+     */
+    public int getNum() {
+      return num;
+    }
+
+    /**
+     * <code>optional uint32 num = 9;</code>
+     * @param value the num to set
+     * @return this
+     */
+    public ReserveStaminaExchangeScRsp setNum(final int value) {
+      bitField0_ |= 0x00000001;
+      num = value;
+      return this;
+    }
+
+    /**
+     * <code>optional uint32 retcode = 13;</code>
+     * @return whether the retcode field is set
+     */
+    public boolean hasRetcode() {
+      return (bitField0_ & 0x00000002) != 0;
+    }
+
+    /**
+     * <code>optional uint32 retcode = 13;</code>
+     * @return this
+     */
+    public ReserveStaminaExchangeScRsp clearRetcode() {
+      bitField0_ &= ~0x00000002;
+      retcode = 0;
+      return this;
+    }
+
+    /**
+     * <code>optional uint32 retcode = 13;</code>
+     * @return the retcode
+     */
+    public int getRetcode() {
+      return retcode;
+    }
+
+    /**
+     * <code>optional uint32 retcode = 13;</code>
+     * @param value the retcode to set
+     * @return this
+     */
+    public ReserveStaminaExchangeScRsp setRetcode(final int value) {
+      bitField0_ |= 0x00000002;
+      retcode = value;
+      return this;
+    }
+
+    @Override
+    public ReserveStaminaExchangeScRsp copyFrom(final ReserveStaminaExchangeScRsp other) {
+      cachedSize = other.cachedSize;
+      if ((bitField0_ | other.bitField0_) != 0) {
+        bitField0_ = other.bitField0_;
+        num = other.num;
+        retcode = other.retcode;
+      }
+      return this;
+    }
+
+    @Override
+    public ReserveStaminaExchangeScRsp mergeFrom(final ReserveStaminaExchangeScRsp other) {
+      if (other.isEmpty()) {
+        return this;
+      }
+      cachedSize = -1;
+      if (other.hasNum()) {
+        setNum(other.num);
+      }
+      if (other.hasRetcode()) {
+        setRetcode(other.retcode);
+      }
+      return this;
+    }
+
+    @Override
+    public ReserveStaminaExchangeScRsp clear() {
+      if (isEmpty()) {
+        return this;
+      }
+      cachedSize = -1;
+      bitField0_ = 0;
+      num = 0;
+      retcode = 0;
+      return this;
+    }
+
+    @Override
+    public ReserveStaminaExchangeScRsp clearQuick() {
+      if (isEmpty()) {
+        return this;
+      }
+      cachedSize = -1;
+      bitField0_ = 0;
+      return this;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+      if (o == this) {
+        return true;
+      }
+      if (!(o instanceof ReserveStaminaExchangeScRsp)) {
+        return false;
+      }
+      ReserveStaminaExchangeScRsp other = (ReserveStaminaExchangeScRsp) o;
+      return bitField0_ == other.bitField0_
+        && (!hasNum() || num == other.num)
+        && (!hasRetcode() || retcode == other.retcode);
+    }
+
+    @Override
+    public void writeTo(final ProtoSink output) throws IOException {
+      if ((bitField0_ & 0x00000001) != 0) {
+        output.writeRawByte((byte) 72);
+        output.writeUInt32NoTag(num);
+      }
+      if ((bitField0_ & 0x00000002) != 0) {
+        output.writeRawByte((byte) 104);
+        output.writeUInt32NoTag(retcode);
+      }
+    }
+
+    @Override
+    protected int computeSerializedSize() {
+      int size = 0;
+      if ((bitField0_ & 0x00000001) != 0) {
+        size += 1 + ProtoSink.computeUInt32SizeNoTag(num);
+      }
+      if ((bitField0_ & 0x00000002) != 0) {
+        size += 1 + ProtoSink.computeUInt32SizeNoTag(retcode);
+      }
+      return size;
+    }
+
+    @Override
+    @SuppressWarnings("fallthrough")
+    public ReserveStaminaExchangeScRsp mergeFrom(final ProtoSource input) throws IOException {
+      // Enabled Fall-Through Optimization (QuickBuffers)
+      int tag = input.readTag();
+      while (true) {
+        switch (tag) {
+          case 72: {
+            // num
+            num = input.readUInt32();
+            bitField0_ |= 0x00000001;
+            tag = input.readTag();
+            if (tag != 104) {
+              break;
+            }
+          }
+          case 104: {
+            // retcode
+            retcode = input.readUInt32();
+            bitField0_ |= 0x00000002;
+            tag = input.readTag();
+            if (tag != 0) {
+              break;
+            }
+          }
+          case 0: {
+            return this;
+          }
+          default: {
+            if (!input.skipField(tag)) {
+              return this;
+            }
+            tag = input.readTag();
+            break;
+          }
+        }
+      }
+    }
+
+    @Override
+    public void writeTo(final JsonSink output) throws IOException {
+      output.beginObject();
+      if ((bitField0_ & 0x00000001) != 0) {
+        output.writeUInt32(FieldNames.num, num);
+      }
+      if ((bitField0_ & 0x00000002) != 0) {
+        output.writeUInt32(FieldNames.retcode, retcode);
+      }
+      output.endObject();
+    }
+
+    @Override
+    public ReserveStaminaExchangeScRsp mergeFrom(final JsonSource input) throws IOException {
+      if (!input.beginObject()) {
+        return this;
+      }
+      while (!input.isAtEnd()) {
+        switch (input.readFieldHash()) {
+          case 109446: {
+            if (input.isAtField(FieldNames.num)) {
+              if (!input.trySkipNullValue()) {
+                num = input.readUInt32();
+                bitField0_ |= 0x00000001;
+              }
+            } else {
+              input.skipUnknownField();
+            }
+            break;
+          }
+          case 1097936398: {
+            if (input.isAtField(FieldNames.retcode)) {
+              if (!input.trySkipNullValue()) {
+                retcode = input.readUInt32();
+                bitField0_ |= 0x00000002;
+              }
+            } else {
+              input.skipUnknownField();
+            }
+            break;
+          }
+          default: {
+            input.skipUnknownField();
+            break;
+          }
+        }
+      }
+      input.endObject();
+      return this;
+    }
+
+    @Override
+    public ReserveStaminaExchangeScRsp clone() {
+      return new ReserveStaminaExchangeScRsp().copyFrom(this);
+    }
+
+    @Override
+    public boolean isEmpty() {
+      return ((bitField0_) == 0);
+    }
+
+    public static ReserveStaminaExchangeScRsp parseFrom(final byte[] data) throws
+        InvalidProtocolBufferException {
+      return ProtoMessage.mergeFrom(new ReserveStaminaExchangeScRsp(), data).checkInitialized();
+    }
+
+    public static ReserveStaminaExchangeScRsp parseFrom(final ProtoSource input) throws
+        IOException {
+      return ProtoMessage.mergeFrom(new ReserveStaminaExchangeScRsp(), input).checkInitialized();
+    }
+
+    public static ReserveStaminaExchangeScRsp parseFrom(final JsonSource input) throws IOException {
+      return ProtoMessage.mergeFrom(new ReserveStaminaExchangeScRsp(), input).checkInitialized();
+    }
+
+    /**
+     * @return factory for creating ReserveStaminaExchangeScRsp messages
+     */
+    public static MessageFactory<ReserveStaminaExchangeScRsp> getFactory() {
+      return ReserveStaminaExchangeScRspFactory.INSTANCE;
+    }
+
+    private enum ReserveStaminaExchangeScRspFactory implements MessageFactory<ReserveStaminaExchangeScRsp> {
+      INSTANCE;
+
+      @Override
+      public ReserveStaminaExchangeScRsp create() {
+        return ReserveStaminaExchangeScRsp.newInstance();
+      }
+    }
+
+    /**
+     * Contains name constants used for serializing JSON
+     */
+    static class FieldNames {
+      static final FieldName num = FieldName.forField("num");
+
+      static final FieldName retcode = FieldName.forField("retcode");
+    }
+  }
+}
diff --git a/src/main/java/emu/lunarcore/game/player/Player.java b/src/main/java/emu/lunarcore/game/player/Player.java
index ceb163d..844836b 100644
--- a/src/main/java/emu/lunarcore/game/player/Player.java
+++ b/src/main/java/emu/lunarcore/game/player/Player.java
@@ -72,6 +72,7 @@ public class Player {
     private int talentPoints; // Rogue talent points
     
     private int stamina;
+    private double staminaReserve;
     private long nextStaminaRecover;
 
     private transient Battle battle;
@@ -130,6 +131,7 @@ public class Player {
         this.headIcon = 200001;
         this.level = 1;
         this.stamina = GameConstants.MAX_STAMINA;
+        this.nextStaminaRecover = System.currentTimeMillis();
 
         this.unlockedHeadIcons = new IntOpenHashSet();
         this.lineupManager = new LineupManager(this);
@@ -367,6 +369,20 @@ public class Player {
         this.sendPacket(new PacketStaminaInfoScNotify(this));
     }
     
+    public int exchangeReserveStamina(int amount) {
+        // Sanity checks
+        if (amount <= 0 || this.staminaReserve < amount) {
+            return 0;
+        }
+        
+        this.staminaReserve -= amount;
+        this.stamina += amount;
+        
+        // Update to client
+        this.sendPacket(new PacketStaminaInfoScNotify(this));
+        return amount;
+    }
+    
     private void updateStamina() {
         // Get current timestamp
         long time = System.currentTimeMillis();
@@ -378,12 +394,17 @@ public class Player {
             if (this.stamina < GameConstants.MAX_STAMINA) {
                 this.stamina += 1;
                 hasChanged = true;
+            } else if (this.stamina < GameConstants.MAX_STAMINA_RESERVE) {
+                double amount = (time - this.nextStaminaRecover) / (18D * 60D * 1000D);
+                this.staminaReserve = Math.min(this.staminaReserve + amount, GameConstants.MAX_STAMINA_RESERVE);
+                hasChanged = true;
             }
             
             // Calculate next stamina recover time
             if (this.stamina >= GameConstants.MAX_STAMINA) {
                 this.nextStaminaRecover = time;
             }
+            
             this.nextStaminaRecover += 5 * 60 * 1000;
         }
         
diff --git a/src/main/java/emu/lunarcore/server/packet/recv/HandlerReserveStaminaExchangeCsReq.java b/src/main/java/emu/lunarcore/server/packet/recv/HandlerReserveStaminaExchangeCsReq.java
new file mode 100644
index 0000000..487f120
--- /dev/null
+++ b/src/main/java/emu/lunarcore/server/packet/recv/HandlerReserveStaminaExchangeCsReq.java
@@ -0,0 +1,21 @@
+package emu.lunarcore.server.packet.recv;
+
+import emu.lunarcore.proto.ReserveStaminaExchangeCsReqOuterClass.ReserveStaminaExchangeCsReq;
+import emu.lunarcore.server.game.GameSession;
+import emu.lunarcore.server.packet.CmdId;
+import emu.lunarcore.server.packet.Opcodes;
+import emu.lunarcore.server.packet.PacketHandler;
+import emu.lunarcore.server.packet.send.PacketReserveStaminaExchangeScRsp;
+
+@Opcodes(CmdId.ReserveStaminaExchangeCsReq)
+public class HandlerReserveStaminaExchangeCsReq extends PacketHandler {
+
+    @Override
+    public void handle(GameSession session, byte[] header, byte[] data) throws Exception {
+        var req = ReserveStaminaExchangeCsReq.parseFrom(data);
+        
+        int exchangedAmount = session.getPlayer().exchangeReserveStamina(req.getNum());
+        session.send(new PacketReserveStaminaExchangeScRsp(exchangedAmount));
+    }
+
+}
diff --git a/src/main/java/emu/lunarcore/server/packet/send/PacketReserveStaminaExchangeScRsp.java b/src/main/java/emu/lunarcore/server/packet/send/PacketReserveStaminaExchangeScRsp.java
new file mode 100644
index 0000000..e596ddb
--- /dev/null
+++ b/src/main/java/emu/lunarcore/server/packet/send/PacketReserveStaminaExchangeScRsp.java
@@ -0,0 +1,22 @@
+package emu.lunarcore.server.packet.send;
+
+import emu.lunarcore.proto.ReserveStaminaExchangeScRspOuterClass.ReserveStaminaExchangeScRsp;
+import emu.lunarcore.server.packet.BasePacket;
+import emu.lunarcore.server.packet.CmdId;
+
+public class PacketReserveStaminaExchangeScRsp extends BasePacket {
+
+    public PacketReserveStaminaExchangeScRsp(int amount) {
+        super(CmdId.ReserveStaminaExchangeScRsp);
+        
+        var data = ReserveStaminaExchangeScRsp.newInstance();
+        
+        if (amount > 0) {
+            data.setNum(amount);
+        } else {
+            data.setRetcode(1);
+        }
+        
+        this.setData(data);
+    }
+}
diff --git a/src/main/java/emu/lunarcore/server/packet/send/PacketStaminaInfoScNotify.java b/src/main/java/emu/lunarcore/server/packet/send/PacketStaminaInfoScNotify.java
index 7503b0b..d3722b0 100644
--- a/src/main/java/emu/lunarcore/server/packet/send/PacketStaminaInfoScNotify.java
+++ b/src/main/java/emu/lunarcore/server/packet/send/PacketStaminaInfoScNotify.java
@@ -12,7 +12,8 @@ public class PacketStaminaInfoScNotify extends BasePacket {
         
         var data = StaminaInfoScNotify.newInstance()
                 .setNextRecoverTime(player.getNextStaminaRecover() / 1000)
-                .setStamina(player.getStamina());
+                .setStamina(player.getStamina())
+                .setReserveStamina((int) Math.floor(player.getStaminaReserve()));
         
         this.setData(data);
     }