Sleem is a spirit in the Chest of Rage. He is a crown prince, the seventh child of the Lord of Ashur Swamps. He calls himself a scragg, meaning "child of the poisonous abyss". The pangolins were wiped out by winder, while Sleem was found by a demon's emmisaries, before being bound to the chest.
He claims to be part of the same world of Endoria before the titans came, and were the first to build civilization in the poisonous swamps. The Titans came after, being made from gods and the divine spark.
To serve you, he will request meat - specifically those with swamp poison.