diff --git a/module/actor.js b/module/actor.js
index e466049d..4a076fd8 100644
--- a/module/actor.js
+++ b/module/actor.js
@@ -706,6 +706,7 @@ export class RdDActor extends Actor {
     } else {
       console.log("Competence not found", compName);
     }
+    RdDUtility.checkThanatosXP( compName );
   }
 
     /* -------------------------------------------- */
diff --git a/module/item-competence.js b/module/item-competence.js
index 8bd78974..deca47f1 100644
--- a/module/item-competence.js
+++ b/module/item-competence.js
@@ -59,10 +59,12 @@ export class RdDItemCompetence extends Item {
   static computeCompetenceXPCost(competence) {
     let xp = RdDItemCompetence.getDeltaXp(competence.data.base, competence.data.niveau ?? competence.data.base);
     xp += competence.data.xp ?? 0;
+    if ( competence.name.includes('Thanatos') ) xp *= 2; /// Thanatos compte double !
     xp += competence.data.xp_sort ?? 0;
     return xp;
   }
 
+  /* -------------------------------------------- */
   static computeEconomieCompetenceTroncXP(competences) {
     let economie = 0;
     for (let troncList of competenceTroncs) {
@@ -87,17 +89,20 @@ export class RdDItemCompetence extends Item {
     return RdDItemCompetence.getCompetenceXp(niveau + 1);
   }
 
+  /* -------------------------------------------- */
   static getCompetenceXp(niveau) {
     RdDItemCompetence._valideNiveau(niveau);
     return niveau < -10 ? 0 : competence_xp_par_niveau[niveau + 10];
   }
 
+  /* -------------------------------------------- */
   static getDeltaXp(from, to) {
     RdDItemCompetence._valideNiveau(from);
     RdDItemCompetence._valideNiveau(to);
     return competence_xp_cumul[to] - competence_xp_cumul[from];
   }
 
+  /* -------------------------------------------- */
   static _valideNiveau(niveau){
     if (niveau < -11 || niveau > competence_niveau_max) {
       console.warn("Niveau en dehors des niveaux de compétences: [-11, " + competence_niveau_max + "]", niveau)
diff --git a/module/item-sheet.js b/module/item-sheet.js
index 54931c78..f70e3483 100644
--- a/module/item-sheet.js
+++ b/module/item-sheet.js
@@ -80,6 +80,12 @@ export class RdDItemSheet extends ItemSheet {
     // Select competence categorie
     html.find("#categorie").on("click", this._onClickSelectCategorie.bind(this) );
 
+    html.find('#sheet-competence-xp').change((event) => {
+      if ( this.object.data.type == 'competence') { 
+        RdDUtility.checkThanatosXP( this.object.data.name );
+      }
+    } );
+
     html.find('#creer-tache-livre').click((event) => {
       let actorId = event.currentTarget.attributes['data-actor-id'].value;
       let actor = game.actors.get( actorId );
diff --git a/module/rdd-utility.js b/module/rdd-utility.js
index 9d892c9f..db036798 100644
--- a/module/rdd-utility.js
+++ b/module/rdd-utility.js
@@ -1021,5 +1021,15 @@ export class RdDUtility {
       ui.notifications.warn("Pas d'heure de naissance selectionnée")
     }
   }
-
+  
+  /* -------------------------------------------- */
+  static checkThanatosXP(compName) {
+    if ( compName.includes('Thanatos') ) {
+      let message = "Vous avez mis des points d'Expérience dans la Voie de Thanatos !<br>Vous devez réduire manuellement d'un même montant d'XP une autre compétence Draconique.";
+      ChatMessage.create({
+        whisper: ChatMessage.getWhisperRecipients(game.user.name),
+        content: message
+      });
+    }
+  }
 }
diff --git a/templates/item-competence-sheet.html b/templates/item-competence-sheet.html
index 7d297780..17fefbb0 100644
--- a/templates/item-competence-sheet.html
+++ b/templates/item-competence-sheet.html
@@ -28,7 +28,7 @@
       </div>
       <div class="form-group">
         <label for="xp">XP </label>
-        <input class="attribute-value" type="text" name="data.xp" value="{{data.xp}}" data-dtype="Number"/>
+        <input class="attribute-value" id="sheet-competence-xp" type="text" name="data.xp" value="{{data.xp}}" data-dtype="Number"/>
       </div>
       <div class="form-group">
         <label for="base">Niveau de base </label>