another one of his skills is summoning these black balls or something like that, i dont know what they're called but you just have to use reflega and they obscure your vision
he usually follows the skill with a heartless angel or a flash combo
if he is using the heartless angel GO STRAIGHT FOR HIM AFTER REFLECT

3rd skill is some volcanic move just have to keep on walking and jumping out of range, it helps if you have quick run

when he drops below 1/3 HP his hands glow black
his sword range goes much longer and he does more dmg
in addition he also has a new technique

he summons a meteor shower which is VERY EASY to avoid just keep on running around

oops i forgot, if he starts using heartless angel and you know your doomed, just use trinity, it makes you invulnerable and automatically makes you attack him

yea, so if you guys didnt hit the back button, you should know how to beat sephiroth now