diff --git a/MMOCore-API/src/main/java/net/Indyuce/mmocore/party/compat/DungeonsXLPartyModule.java b/MMOCore-API/src/main/java/net/Indyuce/mmocore/party/compat/DungeonsXLPartyModule.java
index efb32c8e..92f89b17 100644
--- a/MMOCore-API/src/main/java/net/Indyuce/mmocore/party/compat/DungeonsXLPartyModule.java
+++ b/MMOCore-API/src/main/java/net/Indyuce/mmocore/party/compat/DungeonsXLPartyModule.java
@@ -1,17 +1,30 @@
 package net.Indyuce.mmocore.party.compat;
 
+import com.alessiodp.parties.api.events.bukkit.player.BukkitPartiesPlayerPostJoinEvent;
+import com.alessiodp.parties.api.events.bukkit.player.BukkitPartiesPlayerPostLeaveEvent;
 import de.erethon.dungeonsxl.DungeonsXL;
+import de.erethon.dungeonsxl.api.event.group.GroupDisbandEvent;
+import de.erethon.dungeonsxl.api.event.group.GroupPlayerJoinEvent;
+import de.erethon.dungeonsxl.api.event.group.GroupPlayerLeaveEvent;
 import de.erethon.dungeonsxl.api.player.PlayerGroup;
+import net.Indyuce.mmocore.MMOCore;
 import net.Indyuce.mmocore.api.player.PlayerData;
 import net.Indyuce.mmocore.party.AbstractParty;
 import net.Indyuce.mmocore.party.PartyModule;
+import org.bukkit.Bukkit;
 import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
 
 import java.util.ArrayList;
 import java.util.List;
 import java.util.UUID;
 
-public class DungeonsXLPartyModule implements PartyModule {
+public class DungeonsXLPartyModule implements PartyModule, Listener {
+
+    public DungeonsXLPartyModule() {
+        Bukkit.getPluginManager().registerEvents(this, MMOCore.plugin);
+    }
 
     @Override
     public AbstractParty getParty(PlayerData playerData) {
@@ -19,7 +32,43 @@ public class DungeonsXLPartyModule implements PartyModule {
         return group == null ? null : new CustomParty(group);
     }
 
-    class CustomParty implements AbstractParty {
+    @EventHandler
+    public void onPlayerJoin(GroupPlayerJoinEvent event) {
+        //We add 1 because this returns the members of the group excluding the player that just joined.
+        int membersSize = event.getGroup().getMembers().size() + 1;
+        applyStatBonuses(PlayerData.get(event.getPlayer().getPlayer()), membersSize);
+        event.getGroup().getMembers().getOnlinePlayers()
+                .forEach(p -> applyStatBonuses(PlayerData.get(p), membersSize));
+    }
+
+    @EventHandler
+    public void onPlayerLeave(GroupPlayerLeaveEvent event) {
+        int membersSize = event.getGroup().getMembers().size();
+        clearStatBonuses(PlayerData.get(event.getPlayer().getPlayer()));
+        event.getGroup().getMembers().getOnlinePlayers()
+                .forEach(p -> applyStatBonuses(PlayerData.get(p), membersSize));
+    }
+
+    @EventHandler
+    public void onGroupDisband(GroupDisbandEvent event) {
+        event.getGroup().getMembers().getOnlinePlayers().forEach(p -> clearStatBonuses(PlayerData.get(p)));
+    }
+
+    /**
+     * Applies party stat bonuses to a specific player
+     */
+    private void applyStatBonuses(PlayerData player, int membersSize) {
+        MMOCore.plugin.partyManager.getBonuses().forEach(buff -> buff.multiply(membersSize - 1).register(player.getMMOPlayerData()));
+    }
+
+    /**
+     * Clear party stat bonuses from a player
+     */
+    private void clearStatBonuses(PlayerData player) {
+        MMOCore.plugin.partyManager.getBonuses().forEach(buff -> buff.unregister(player.getMMOPlayerData()));
+    }
+
+    class CustomParty implements AbstractParty, Listener {
         private final PlayerGroup group;
 
         public CustomParty(PlayerGroup group) {
@@ -48,5 +97,6 @@ public class DungeonsXLPartyModule implements PartyModule {
         public int countMembers() {
             return group.getMembers().getUniqueIds().size();
         }
+
     }
 }
diff --git a/MMOCore-API/src/main/java/net/Indyuce/mmocore/party/compat/McMMOPartyModule.java b/MMOCore-API/src/main/java/net/Indyuce/mmocore/party/compat/McMMOPartyModule.java
index 7283bffa..5da0bf71 100644
--- a/MMOCore-API/src/main/java/net/Indyuce/mmocore/party/compat/McMMOPartyModule.java
+++ b/MMOCore-API/src/main/java/net/Indyuce/mmocore/party/compat/McMMOPartyModule.java
@@ -2,17 +2,28 @@ package net.Indyuce.mmocore.party.compat;
 
 import com.gmail.nossr50.datatypes.party.Party;
 import com.gmail.nossr50.datatypes.player.McMMOPlayer;
+import com.gmail.nossr50.events.party.McMMOPartyChangeEvent;
+import com.gmail.nossr50.party.PartyManager;
 import com.gmail.nossr50.util.player.UserManager;
+import net.Indyuce.mmocore.MMOCore;
 import net.Indyuce.mmocore.api.player.PlayerData;
 import net.Indyuce.mmocore.party.AbstractParty;
 import net.Indyuce.mmocore.party.PartyModule;
+import org.bukkit.Bukkit;
 import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
 import org.jetbrains.annotations.Nullable;
 
 import java.util.ArrayList;
 import java.util.List;
 
-public class McMMOPartyModule implements PartyModule {
+public class McMMOPartyModule implements PartyModule, Listener {
+
+
+    public McMMOPartyModule() {
+        Bukkit.getPluginManager().registerEvents(this, MMOCore.plugin);
+    }
 
     @Nullable
     @Override
@@ -22,11 +33,53 @@ public class McMMOPartyModule implements PartyModule {
         return party == null ? null : new CustomParty(party);
     }
 
-    class CustomParty implements AbstractParty {
+
+    @EventHandler
+    public void onChange(McMMOPartyChangeEvent event) {
+        if (event.getNewParty() != null) {
+            Party party = PartyManager.getParty(event.getNewParty());
+            if (party != null) {
+                //This is the size of the party before the player joins=> we increment it by 1.
+                int membersSize = party.getMembers().size();
+                if(membersSize!=1 || party.getOnlineMembers().get(0)!=event.getPlayer()) {
+                    party.getOnlineMembers()
+                            .forEach(p -> applyStatBonuses(PlayerData.get(p), membersSize+1));
+                    applyStatBonuses(PlayerData.get(event.getPlayer()), membersSize+1);
+                }
+            }
+        }
+        if (event.getOldParty() != null) {
+            Party party = PartyManager.getParty(event.getOldParty());
+            if (party != null) {
+                //This is the size of the party before the player leaves=> we decrement it by 1.
+                int membersSize = party.getMembers().size() - 1;
+                party.getOnlineMembers()
+                        .forEach(p -> applyStatBonuses(PlayerData.get(p), membersSize));
+                clearStatBonuses(PlayerData.get(event.getPlayer().getPlayer()));
+            }
+        }
+    }
+
+    /**
+     * Applies party stat bonuses to a specific player
+     */
+    private void applyStatBonuses(PlayerData player, int membersSize) {
+        MMOCore.plugin.partyManager.getBonuses().forEach(buff -> buff.multiply(membersSize - 1).register(player.getMMOPlayerData()));
+    }
+
+    /**
+     * Clear party stat bonuses from a player
+     */
+    private void clearStatBonuses(PlayerData player) {
+        MMOCore.plugin.partyManager.getBonuses().forEach(buff -> buff.unregister(player.getMMOPlayerData()));
+    }
+
+    class CustomParty implements AbstractParty, Listener {
         private final Party party;
 
         public CustomParty(Party party) {
             this.party = party;
+            Bukkit.getPluginManager().registerEvents(this, MMOCore.plugin);
         }
 
         @Override
diff --git a/MMOCore-API/src/main/java/net/Indyuce/mmocore/party/compat/PartiesPartyModule.java b/MMOCore-API/src/main/java/net/Indyuce/mmocore/party/compat/PartiesPartyModule.java
index 480d5fbd..07edf5da 100644
--- a/MMOCore-API/src/main/java/net/Indyuce/mmocore/party/compat/PartiesPartyModule.java
+++ b/MMOCore-API/src/main/java/net/Indyuce/mmocore/party/compat/PartiesPartyModule.java
@@ -1,20 +1,29 @@
 package net.Indyuce.mmocore.party.compat;
 
 import com.alessiodp.parties.api.Parties;
+import com.alessiodp.parties.api.events.bukkit.player.BukkitPartiesPlayerPostJoinEvent;
+import com.alessiodp.parties.api.events.bukkit.player.BukkitPartiesPlayerPostLeaveEvent;
 import com.alessiodp.parties.api.interfaces.PartiesAPI;
 import com.alessiodp.parties.api.interfaces.Party;
 import com.alessiodp.parties.api.interfaces.PartyPlayer;
+import net.Indyuce.mmocore.MMOCore;
 import net.Indyuce.mmocore.api.player.PlayerData;
 import net.Indyuce.mmocore.party.AbstractParty;
 import net.Indyuce.mmocore.party.PartyModule;
 import org.bukkit.Bukkit;
 import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
 import org.jetbrains.annotations.Nullable;
 
 import java.util.ArrayList;
 import java.util.List;
 
-public class PartiesPartyModule implements PartyModule {
+public class PartiesPartyModule implements PartyModule,Listener {
+
+    public PartiesPartyModule(){
+        Bukkit.getPluginManager().registerEvents(this,MMOCore.plugin);
+    }
 
     @Nullable
     @Override
@@ -25,7 +34,36 @@ public class PartiesPartyModule implements PartyModule {
         return party == null ? null : new CustomParty(party);
     }
 
-    class CustomParty implements AbstractParty {
+
+    @EventHandler
+    public void onPlayerJoin(BukkitPartiesPlayerPostJoinEvent event){
+        int membersSize=event.getParty().getMembers().size();
+        event.getParty().getOnlineMembers()
+                .forEach(p-> applyStatBonuses(PlayerData.get(p.getPlayerUUID()),membersSize));
+    }
+    @EventHandler
+    public void onPlayerLeave(BukkitPartiesPlayerPostLeaveEvent event){
+        int membersSize=event.getParty().getMembers().size();
+        clearStatBonuses(PlayerData.get(event.getPartyPlayer().getPlayerUUID()));
+        event.getParty().getOnlineMembers()
+                .forEach(p-> applyStatBonuses(PlayerData.get(p.getPlayerUUID()),membersSize));
+    }
+
+    /**
+     * Applies party stat bonuses to a specific player
+     */
+    private void applyStatBonuses(PlayerData player,int membersSize) {
+        MMOCore.plugin.partyManager.getBonuses().forEach(buff -> buff.multiply(membersSize - 1).register(player.getMMOPlayerData()));
+    }
+
+    /**
+     * Clear party stat bonuses from a player
+     */
+    private void clearStatBonuses(PlayerData player) {
+        MMOCore.plugin.partyManager.getBonuses().forEach(buff -> buff.unregister(player.getMMOPlayerData()));
+    }
+
+    class CustomParty implements AbstractParty  {
         private final Party party;
 
         public CustomParty(Party party) {