Cloud strife one day was outside Midgar and fitting monstrers. He was geting his daily exervise because he need it and was getting old and was only member of team still live.
Gerting older had make Cloud depressed and emo and angry at world and now the only thing he oculd do now was to fight monsters and try get stronger.
Suddenly Sephiroth appeared in front of him! "Haha cloud!" Sephiroth laughed and yelled at Cloud. "I hop you not for get your best enemy!" Cloud shouted angry, "No! I thought I kill you!" "Haha No!" Sephiroth laughed and yelled again "You may think I die at end of Advent movie but that was just my soul going into lifestream and using for time travel! Now I come to you when weak and beat you and take over world in future!" Cloud yelled as anger "No!" and pull smaller sword out of big sword and start fighting Sephiroht.
However Cloud was still very old and weak and so was not able to kill or fight very well. Sephiroth laughed and yelled "You see Cloud you are now old man but with time travel I am still strong and powerful and can defeat you with easey!" Sephiroth run at Cloud and stab him with sword and it critical hit and cause 9999 damage and kill cloud. Sephiroth laughed and yelled "Haha! I win and I will ruel the world!" But time travel have price. Sephiroth old body not able to take new Lifestream mako and explod with a really big boom. Cloud was still dead, but now Sephiroth not able to kill either.