Ender King

The Ender King was the primary adversary to the Blaze Empress. He resided in Endlantis. The King wanted to combine all the realms. "'The EnderKing was a large, ambitious, and powerful deity. He was greedy for power and greedy for beauty. His goal was to take large parts of the other realms and merge them altogether for himself. It took all the other large deities to stop his plan and save the realms.' - @qloof"

Lore
The Ender King was a greedy creature. He used to steal bits and bops from the overworld, as endermen do. Eventually, though, his greed for power and treasure grew. He began stealing bits of other dimensions and realms, adding them to his own kingdom in the End. His goal: To transport every single realm, the Overworld, the Nether, the End, to his kingdom.

His plans were ruined, though, due to the involvement of four other godlike entities, who combined their powers to stop the Ender King. Ultimately, the King flooded his own realm with water, destroying it and killing all of his people. He fled to the underground of his land, his lair, hiding till his final hour amongst his treasures.

The Ender King took part of the Nether, being part of the reason why the Nether Void was created.