KOTR definately helps but every time you use it on Ruby
Weapon he retaliates with ultima. So Quadra Magic in a
linked slot with Bahamut Zero on cloud, Mimes and
Hp><Mp on everybody should do it. Also fill any extra
slots with mastered Mp+, this will let you have sufficient
Hp since they're switched. You should also have the
best weapons for the characters you are going to use
such as for Cloud, Cid, and Vincent, you'd need
respectively Ultima weapon, Venus Gosple, and Death
Penalty. and Wizard bangals help too. All of the
Equipment I sugest has 8 slots. So ansewer me this
Shivas Effect, Do you know the number stats of the
weapons you seek to kill?