To be more specific, you need to place a demon on the map, which is one of the quest monsters, but it is disguised as a tree. The player can kill the demoness to make the illusion disappear, or find it themselves by listening to rumors in the tavern. The problem is that I can't change the quest type when I change the quest mob, so this task can only be accomplished by changing its model display on the map. All my attempts ended with a crash to the desktop.