The Nowhere King, an abomination created from love, hatred, and mixed magics. There's only one goal in his mind, to cause suffering to the one that did the same to him so long ago. After his defeat from the reunion of the two worlds though, the idea of simply having it all end then and there sounded more appealing than ever, but fate simply wont let that happen. Whisked away to a third world, unknown to the others, the Nowhere King's suffering will only be prolonged.
Crossover with Centaur world(Centaurworld), also major spoilers, like the end of the show is spoiled in the first paragraph. You have been warned.