Rat King is a hostile boss mob that spawns and throws rats at the player to attack. The rats can be tamed after their master's death. It does not spawn naturally and must be created by a player. This can be done by right-clicking on a rat with a Ball of Filth in your hand.
Despite being classified as a boss mob, the Rat King does not possess a boss bar due to unknown reasons.
Spawning[]
To summon a Rat King, use a Ball of Filth on any Rat.