Final Fantasy X Tips

Living is (a) Sin
This is the coolest thing I've ever done, i picked it up off of Seymour. Have Auron (or another character) learn Zombie Attack, then have him (or, once again, another character) learn Life or Full Life, then, in battle, attack a fiend with Zombie Attack, and on your next turn cast Life or Full Life on the fiend as well, therefore killing the fiend. It is a little more reliable than Death, and its cooler to say you killed a fiend with a healing spell.

-(NOTE: it may not always work, considering the immunities of the fiend.)-