HP: 100,000 (may raise after each character in your team reaches level 95)
MP: ???
Location: Northern Crater, Inside the Planet after defeating Bizzaro Sephiroth.
Note: All damage measurements are based on my own experience.
"The One Winged Angel", the final boss of FFVII has several attacks with the potential for dealing heavy damage to your party.
Super Nova: This seems to be his main attack, it deals around 5000 damage to everyone. Higher level characters will have less of a problem with this, although he uses it often.
Pale Horse: Massive damage to one character.
Heartless Angel: Rarely used, but lowers all character's HP to 1. You should have time to heal using a megalixer or cure3 spell before he attacks again.
Physical attack: Sephiroth attacks one character with his wing, dealing around 1000 damage (depending on your defensive stats).
I think that covers all of them...
Safer Sephiroth should give you enough time to heal in between attacks.
The team I used for this battle was Cloud, Yuffie, and Vincent. Equip their ultimate weapons if you have them, because you no longer have need for materia growth. This is the final battle.
The first things you should do in this fight are to cast Wall or the enemy skill Big Guard (if you need to), and then cast DeBarrier on Sephiroth. He will cast Wall on himself if it isn't already on him, and this will dispell it, greatly increasing the amount of damage he recieves.
If you have the Knights of the Round summon, it can kill Sephiroth in around two summons (yes, that easily). Have one character summon it and another use the Mime materia to summon the Knights again.
If you don't have KOTR or Cloud's Omnislash limit, Yuffie's Bloodfest limit break works well. Have a character specializing in offensive magic cast poweful spells such as Flare (contain materia) and Ultima. Have one character ready to cast cure3 (with an All materia) or use a Megalixer after every Super Nova or as needed.
The battle shouldn't take incredibly long, except for the Super Nova attack which takes over a minute just for the animation. How can he even use that attack more than once, it destroys the Solar System o_O...that's phsyically impossible...
After you defeat Safer Sephiroth, Cloud will have to fight Sephiroth alone. You will automatically build up to your Limit Break, and OmniSlash will be available. Use it and the fight as well as the game will be over. You can survive one attack from sephiroth, but you will automatically kill him after that if you have the Counterattack materia equipped. If you want to see Omnislash, use it when you get it.
Stay around after the credits roll to see an epilogue scene with RedXII.
