Sephiroth (Crisis Core boss)

Sephiroth is fought as a boss several times during the Compilation of Final Fantasy VII. Sephiroth's other forms are Safer Sephiroth and Bizarro Sephiroth.

Final Fantasy VII
After defeating Safer Sephiroth, Cloud Strife falls into the Lifestream and fights a metaphysical Sephiroth inside his own mind. 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 learnt 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.

Crisis Core -Final Fantasy VII-
Sephiroth is a boss in Crisis Core. He is fought twice in the Nibelheim Mako Reactor. Virtual versions can later be challenged again in two Missions, as well as Hojo's final experiment of which is labled "Experiment No. 124".

First Battle
In the first battle, Sephiroth can summon four elemental Crystals, and can use the DMW attack, "Octaslash". He can also use "Heartless Angel" which knocks Zack's HP down to 1, this is similar to the "Descend Heartless Angel" attack in The Kingdom Hearts Series, for 2 reasons; one being the name, the second the way it performs, by putting Sora's HP to 1.

Second Battle
Now Zack is standing on a long platform and can only attack Sephiroth from the front. After every attack Sephiroth uses, Zack is knocked back further and further. If Zack is pushed off the platform, it is Game Over. Because of this, Sephiroth is generally easier this time and does not Summon the four Crystals.