[dappa]

You've mastered all your abilities ok. I first defeated him on my first time at level 30 but since then I've been beating him on level 50+. Have everyone on mime. at least one character with the summon magic ability then eveyone else can have various combinations of their other abilities in the mimes customisable slots. Have one character cast guardian then someone summon bahamut then everyone mime it. This is a foolproof strategy cause your characters will get 4 or 5 turns before neo x death gets its turn. Within 6 or 7 summons of bahamut neo x death will fall. I dont recommend any other strategies which involve not hitting all x deaths body parts at once because when he is down to one body part left he seems to speed up and attack constantly with meteo spell. Thats why the mime bahamut strategy works as all his body parts will die at the same time and he cant hammer you with meteo. Hope you find this helpful mate.