How do I beat the Spectral Keeper in Final Fantasy X?

Answer 1

Well, the first thing you'll want to do is cure the Berserked players immediately to prevent him from counterattacking every other character. Plus, you'll want to be able to control them for the fight. If you have a bunch of Aeons, it's a good idea to summon them. He has a special seventh Circle for Aeons, and it's believed that he will only activate a Glyph Mine on that spot after every three hits. You could, then, hit him twice with an Aeon, then dismiss the Aeon and attack with your regular characters, then summon it again.

The battle is tough, but the key is to move away from spots with blinking Circles and immediately treat anyone with Berserk.

Answer 2

here's a youtube video of someone beating the spectral keeper if you want a video demonstration:

http://www.youtube.com/watch?v=KXLCZJ9rWWU