[Gear] Trinket - Fang of Umbral Malignance

engine/player/unique_gear_midnight.cpp

@@ -3134,7 +3134,57 @@ void vile_vial_of_volatile_venom( special_effect_t& effect )
   effect.disable_buff();
   effect.has_use_buff_override = true;
   effect.execute_action = create_proc_action<vile_vial_of_volatile_venom_t>( "empowering_venom", effect );
+}
+
+// Fang of Umbral Malignance
+// 1295219 Driver
+// 1305853 Umbral Malignance DoT
+// 1305854 Bursting Malignance AoE
+void fang_of_umbral_malignance( special_effect_t& effect )
+{
+  auto burst = create_proc_action<generic_aoe_proc_t>( "bursting_malignance", effect, 1305854 );
+  burst->base_multiplier *= role_mult( effect );
+
+  struct fang_cb_t : public dbc_proc_callback_t
+  {
+    action_t* dot;
+
+    fang_cb_t( const special_effect_t& e, action_t* burst_action ) : dbc_proc_callback_t( e.player, e )
+    {
+      dot                      = create_proc_action<generic_proc_t>( "umbral_malignance", e, 1305853 );
+      dot->dot_max_stack       = dot->data().max_stacks();
+      dot->base_td             = e.driver()->effectN( 1 ).average( e );
+      dot->base_td_multiplier *= role_mult( e );
+      dot->add_child( burst_action );
+      target_debuff            = e.player->find_spell( 1305853 );
+    }
+
+    void execute( const spell_data_t*, player_t* t, action_state_t* ) override
+    {
+      dot->execute_on_target( t );
+      get_debuff( t )->trigger();
+    }
+  };
+
+  auto cb        = new fang_cb_t( effect, burst );
+  auto burst_pct = effect.driver()->effectN( 2 ).percent();
+
+  effect.player->register_on_kill_callback( [ cb, burst, burst_pct ]( player_t* t ) {
+    if ( t->sim->event_mgr.canceled )
+      return;
 
+    if ( auto d = cb->dot->find_dot( t ); d && d->is_ticking() )
+    {
+      burst->base_dd_min = burst->base_dd_max = d->tick_damage_over_remaining_time() * burst_pct;
+      burst->execute();
+
+      for ( auto new_target : cb->dot->target_list() )
+      {
+        cb->dot->execute_on_target( new_target );
+        cb->get_debuff( new_target )->trigger();
+      }
+    }
+  } );
 }
 }  // namespace trinkets
 
@@ -4177,6 +4227,7 @@ void register_special_effects()
   register_special_effect( 1295058, trinkets::wavecallers_seastone );
   register_special_effect( 1293316, trinkets::vile_vial_of_volatile_venom );
   register_special_effect( 1295179, DISABLED_EFFECT );  // Vile Vial of Volatile Venom equip driver
+  register_special_effect( 1295219, trinkets::fang_of_umbral_malignance );
   reset_version_check();
   // Weapons
   register_special_effect( { 1253357, 1253359 }, weapons::torments_duality );  // umbral sabre & radiant foil