diff --git a/client/webapp/index.html b/client/webapp/index.html
--- a/client/webapp/index.html
+++ b/client/webapp/index.html
@@ -185,3 +185,3 @@
   <script src="js/engine/world_renderer.js"></script><script src="js/engine/vfx_renderer.js"></script><script src="js/engine/animation_engine.js"></script>
-  <script src="js/engine/entity_renderer.js"></script><script src="js/engine/canvas_renderer.js"></script>
+  <script type="module" src="js/engine/telegraph_renderer.js"></script><script src="js/engine/entity_renderer.js"></script><script src="js/engine/canvas_renderer.js"></script>
   <script src="js/ui/templates/template_catalog_system.js"></script><script src="js/ui/templates/template_catalog_auth.js"></script>
diff --git a/client/webapp/js/engine/entity_renderer.js b/client/webapp/js/engine/entity_renderer.js
--- a/client/webapp/js/engine/entity_renderer.js
+++ b/client/webapp/js/engine/entity_renderer.js
@@ -43,2 +43,7 @@
       }
 
+      // Ground Combat Telegraph Decals (PoE2 Warning Cones & Rings)
+      if (typeof window.TelegraphRenderer !== 'undefined' && typeof window.TelegraphRenderer.renderTelegraphs === 'function') {
+        window.TelegraphRenderer.renderTelegraphs(ctx);
+      }
+
       // 4. COLLECT & SORT DEPTH ENTITIES (PROPS, MONSTER, HERO)
diff --git a/client/webapp/js/engine/monster_system.js b/client/webapp/js/engine/monster_system.js
--- a/client/webapp/js/engine/monster_system.js
+++ b/client/webapp/js/engine/monster_system.js
@@ -158,2 +158,5 @@
 
+  if (typeof window.TelegraphRenderer !== 'undefined' && typeof window.TelegraphRenderer.updateTelegraphs === 'function') {
+    window.TelegraphRenderer.updateTelegraphs(dt);
+  }
   if (typeof window.updateMonsterPackAI === 'function') window.updateMonsterPackAI(activeMonsters, dt);
@@ -178,2 +181,3 @@
     if (m.hp <= 0) {
+      if (typeof window.cancelTelegraph === 'function') window.cancelTelegraph(m.id);
       m.respawnTimer += dt;
@@ -199,2 +203,3 @@
     if (m.staggerTimer > 0) {
+      if (typeof window.cancelTelegraph === 'function') window.cancelTelegraph(m.id);
       m.staggerTimer -= dt;
@@ -213,2 +218,3 @@
     if (distToOrigin > (m.leashRadius || 5.2)) {
+      if (typeof window.cancelTelegraph === 'function') window.cancelTelegraph(m.id);
       m.hasAggro = false;
@@ -237,4 +243,7 @@
       } else if (m.attackCooldown <= 0) {
-        // Attack strike on player!
-        m.attackCooldown = 1.75 + Math.random() * 0.5;
-        executeMonsterAttackOnPlayer(m);
+        m.attackCooldown = (m.isBoss ? 2.4 : 1.8) + Math.random() * 0.5;
+        if (typeof window.TelegraphRenderer !== 'undefined' && typeof window.TelegraphRenderer.startMonsterAttack === 'function') {
+          window.TelegraphRenderer.startMonsterAttack(m, player, executeMonsterAttackOnPlayer);
+        } else {
+          executeMonsterAttackOnPlayer(m);
+        }
       }