Originally Bespoken by Cledarius
I'm surprised that this rumor wasn't mentioned till yet:
The ultimate Boss: Invected Rufus
After Rufus died in the Shinra Tower (Well we know he's not dead but anyway) you have to go to the pipe where that sick guy was. Talk to him and then go in the itme-menu and throw away a Mega-elixir. Then talk again to the sick guy. he thanks you for tying to cure him and gives you a mine. With this mine you have to go to the yellow excavator. Use the mine there and the excavator explodes. Now stairs are visible, where the excavator stood moments before. Go down the stairs. You will end up in a romm, where you will see Rufus kneeing in front of you. He's totally confused and speaks of things like revenge for his father.
Then the fight beginns:
At the very beginning "Invected Rufus" will cast wall on himself. Then he attacks you with "Headshot" which will kill a char immediately. Also he uses "Pest-Blade" (yes in this fight he carries a green glowing blade) that deals 4000 damage and all status abnormalities. After you did him about 30'000 HP damage he uses an attack called "Executioner" which will kill 2 chars immediately. He now has 3 new attacks. One is called "Venom Strike" dealing 5000 damage and poison on all chars. "Shingle" is the second new attack, it deals 10x9999 hp damage to one char. "Holy Curse" is the third new attack, it heals Rufus 5000Hp and all your chars get confused.
If you manage it to kill Rufus (don't know how much Hp he has) he has a last final attack ready for you. A goodbye present called "Armageddon Reopen" it will kill all 3 chars immediately. After the fight you receive his pumpgun (weapon for barret as strong as his ultimate weapon)
Go back to the sick guy and he will thank you and give you 99Mega-Elixir 99Phoenix Downs and a sword for cloud called "Plague" which kills an enemy immediately. (Does not work on bosses)
Soooooooo, doesn't that sound funny? I think the one who invented the whole thing has way too much fantasy.