This method, in my opinion, works better pot-wise. Just because half of the time Reinge will attack and make your players die before it's even your turn. Bring 3-5 Phoenix feathers and about 25 white pots to be on the safe side.. Start attacking and pot a tiny bit, but mainly just attack. Make sure that Antlan ALWAYS stays alive. After everybody dies, just pot with Antlan. Every turn Reinge will attack and you pot back to health, you can't die if you pot every move since Antlan always goes first. After Reinge's MP runs out (10-20 rounds) he won't attack you anymore. At this point revive all your party members using Phoenix Feathers and attack away. Fool-proof.