Sephiroth's will was to be used to create an army of monsters born out of crystallized mako. His underestimation of AVALANCHE lead to his defeat at the final battle when he was so close to victory.
In the final battle, Sephiroth, in his true body, casually handled Cloud in a one-on-one fight and even single-handedly fought him and the other members of AVALANCHE, being able to react to any of their surprise attacks with ease, and despite sustaining enough damage that his Meteor was canceled, he still remained capable of casually proving himself a superior swordsman over Cloud, countering all of Cloud's attacks, sometimes so powerfully to send Cloud flying back, so easily that he sometimes rests it on his shoulder, while forcing Cloud to dodge his own attacks and only having to dodge once before he pushed back Cloud in a clash of blades and blitzed him, subsequently disarming Cloud in a single maneuver. Even after being stabbed by the Buster Sword, Sephiroth was able to resiliently function and remain strong enough to outmatch Cloud, easily disarming and stabbing him with Masamune before he could get close and lifting and throwing him aside a great distance before quickly crossing the distance and stabbing him again, only being overpowered by Cloud's willpower. In the non-canonical pseudepigraphical work, the Sephiroth considering Jenova to be his mother, yet also being implied to have become one with her, may allude to the Christian belief of Jesus Christ being the Son of God, yet also being one and the same with God the Father and God the Holy Spirit via the blessed trinity.
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The Sephiroth are described in the Kabbalah as the manifestations of God that allow Him to manifest in the physical and metaphysical universes, referring to Sephiroth's simultaneous existence in the Lifestream and the Planet, and his manifestations through Jenova. He spares Cloud, saying that the latter has 7 seconds left before the end and leaves as Cloud appears back in Midgar. As Chokmah is force and Binah is form, their conjunction produces a Sephira which is hidden, which has no number and is not shown on the Tree of Life.
His immersion in Lifestream has granted Sephiroth potent psychic powers. Hojo has injected Zack, Cloud and the other survivors of Nibelheim (save for Tifa who was rescued by her mentor Approximately five years after his supposed death, in Sephiroth's true body hibernating in the Northern Cave.Cloud acquires the Black Materia first, but Sephiroth exerts his influence over the Jenova cells within Cloud's body and takes control of him, forcing Cloud to hand the Materia over. With Black Materia, he is capable of performing the most destructive form of magic Meteor, summoning a massive meteor capable of heavily damaging the entire Earth.
Becoming at least somewhat secure in one's own identity as a human being or at least a person of some intrinsic worth is something that generally occurs during childhood. Shinra told him nothing of his true parentage, and he grew up believing his mother's name was "Jenova". In Crisis Core, Sephiroth displays an unseen ability to cast magical shields that could easily block the fires of a dragon and Genesis's fire spell and materialize Fire, Blizzard, Thunder and Support Materia to fight alongside him independently. Other Sephiroth-related items include pendants and rings with the theme of his single wing and/or the Black Materia, cold cast statues and even a These traits refer to Sephiroth's simultaneous existence in the lifestream and the planet, and his manifestations through Jenova. Those inferior dullards. Although mainly preferring melee, Sephiroth was already quite accomplished in the use of Magic and proved fully capable of making liberal use of it in combat.