Nemesis is a superboss in Final Fantasy X created by the old man who runs the Monster Arena in the Calm Lands. Nemesis is an Original Creation monster and a color variation of Ultima Weapon. Often nicknamed "Omega Gold", it is the most durable and most challenging enemy in the original versions of the game (Penance and arguably some of the Dark Aeons in the PAL and International versions of the game are harder), with 10,000,000 Hit Points and an array of spells and attacks that can instantly kill even the highest-level, best-equipped parties.