Sephiroth (Final Fantasy VII boss)

Sephiroth is a boss in Final Fantasy VII. After defeating Safer Sephiroth, Cloud Strife falls into the Lifestream and fights a metaphysical Sephiroth inside the spiritual realm. This boss battle is completely cinematic, as evidenced by how all his stats are 0. Cloud will instantly gain the Limit Break Omnislash even if he has not learned that skill from Gold Saucer's Battle Square. If Cloud does not use Omnislash, Sephiroth will attack for pitiful damage, to which Cloud will instantly counter and win the battle. It is impossible to lose.