I've found a "rat king" monster on floor 5 in a treasure room behind a secret door. I can't seem to attack it, and it just wonders the floor aimlessly. What's the point with that monster? Is there any way to defeat it, or does it have any other gameplay impact?
Taken from the Wiki.
The rat king was added as an easter egg referencing an aprils fools joke on reddit.
The rat king will try to run away from you if he sees you. You cannot harm the rat in any way.
The rat king was added as an easter egg and does nothing but run around the level.
Interacting with it makes it say: "I'm not sleeping!" And Interacting with it again will make it say something else.
The rat king spawns in the rat king room which is lined with chests. The rat king cannot be harmed by any means exept by using a scroll of wipe out.
In remixed pixel duenguoen the rat king can be killed easily