Shin Megami Tensei: Digital Devil Saga

So, here it is at last: Satan! The final optional boss in DDS2. Like Demi-fiend, he will kick your ass time and time again, even if you're prepared. Before you even begin, this is what you need:

Everyone at lvl 99
All stats at or as near to 99 as possible (except for Cielo's Mag!)
An impel stone
Revival Orb
A calculator (or your head if you're clever)

Now then, Satan has 30,000 HP and infinite MP (no joke,) and also has all single hit and multi-hit dyne spells at his disposal, along with Vanity, Mamudoon, Mahamaon, Megidolaon, Dekaja, Debilitate and all -kaja skills. He also has other skills you've never seen before, which in this part are:

Futility - He always starts with this. You know ...