On the right is a chest with a Luck Source. Follow the path until you get to a set of steps. The rest of your friends will turn up and you can talk to them to get various items. Some may not have some, depending the way you told them to go. When you have their items, approach the steps. Choose to either go down or stay. If you choose to go down, you can’t come up, so I suggest going back along the paths that you didn’t do along, to pick up items etc. Once you’re all done up there choose to go down. You’ll leap down the steps towards the centre and can be attacked while descending. After the second set of steps you’ll reach the centre and have to fight the final form of Jenova.
Haste and Barrier/Wall yourself and begin to deal out the damage with Enemy Skills and Summons. After you’ve hit the arms enough they’ll drop but you need to kill the rest of Jenova quickly after that as they will be resurrected after a while, so multi enemy spells and summons are essential here. If you have high attack, physical attacks are good. Her attacks themselves aren’t much to worry about but when she is about to kick the bucket, a countdown will begin, going down from 5 every round. If it hit’s zero, Jenova will cast Ultima ending the fight. But if you end it like this, you won’t get any EXP, Gil or AP for the battle so try and hit her hard to end it quick.
After Jenova’s death, the ground begins to fall apart and Cloud etc begin to float. Sephiroth appears and you’ll get to make a new party and visit the menu before you have to fight the first form of Sephiroth.
Wall/Haste at the beginning to up your defence and use multi enemy attacks again to damage the five parts of Bizzaro. Whenever one of his body parts dies, you are given the option to switch to another party (if you had the choice to make another party). If you have more than one, only one party can attack the centre of Sephiroth’s body, the yellow orb. Once that team has damaged the centre enough you can switch back to Cloud’s party and get that team to attack him. Once you’ve killed the orb attack the other body parts. If you have more than one party, and one team is wiped out the game is over, so watch out. You should also be careful in relation to Cloud’s level as Sephiroth will gain more HP etc compared to his level.
Sephy can heal himself and resurrect body parts. His attacks include Demi 3, a fire ray type attack and an attack that reduces all party members HP to 1 point.
Once Bizzaro Sephiroth has been defeated, Sephiroth shows up in a new form. You fight him with whatever team Cloud is a part of.
Safer Sephiroth can be pretty mean and again his HP etc depend on Cloud’s level. He attacks may ways, can slow and dispel team members, cast Wall on himself and attack with various high level magic. One of his meanest attacks is Supernova that hits all party members. He also has a laser attack and can fly high, preventing some characters from attacking physically.
Use Wall/Haste/Regen and fix any status problems from the previous fight. Again dish it out with best summons (KOTR, Bahamut ZERO), spells (Ultima, Flare) and enemy skills, as well as anything else that deals big damage, such as Coin or Throw, as you won’t be needing money or items anymore!
After killing Safer Sephiroth, Cloud will fight Sephiroth one last time, one on one. It’s very easy and impossible to lose, so either let Cloud counter or use Omnislash (which comes up even if you haven’t learned it). After that is over, enjoy the really long (as most game endings are) ending.