--- deliantra/server/include/object.h	2010/04/07 19:54:45	1.236
+++ deliantra/server/include/object.h	2010/04/09 02:45:16	1.237
@@ -535,6 +535,8 @@
 
   MTH bool is_dragon () const;
 
+  MTH bool is_immunity () const { return invisible && type == SIGN; }
+
   MTH bool has_active_speed () const { return speed >= MIN_ACTIVE_SPEED; }
 
   // temporary: wether the object can be saved in a map file