Mega Man Zero 3

Two months have passed since Elpizo turned mad with power and freed the Dark Elf by destroying the body of the original X. Ciel has finally finished her research on a new energy supply, and Zero is leading a group towards Neo Arcadia to make peace at last. However, readings similar to the Dark Elf emanate from a snow field, and they stop to investigate. Inside a gigantic spaceship that fell from orbit, Zero discovers a massive Reploid, Omega, and the enigmatic Dr. Weil, the one X spoke of when talking about the curse of the Dark Elf. It seems Weil isn't alone this time, either - he has built a new Copy X, and together, the two of them instate a new regime in Neo Arcadia. Zero eventually destroys Omega. While fighting him, he finds that (apparently) his body was merely a copy, while Omega had Zero's true form. Weil, trying to tempt him with this fact, didn't turn out successful. Zero killed Omega with the help of the remaining 3 guardians (Harpuia, Leviathan, Fefnir) and The Dark Elf breaks free of her curse completely, ending the game.