What's the deal with the rat king?

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.

Rat King