Use Script

.@is_HTF_instance = strcharinfo(3) == instance_mapname("1@xm_d", instance_id(IM_PARTY));
.@is_HTF_dungeon = strcharinfo(3) == "xmas_dun03";
if(.@is_HTF_instance || .@is_HTF_dungeon ){
  heal 900,0;
}else{
  heal 180,0;
}