Not only is the enemy named "Time Devourer," but it's an incredibly tedious, boring and stupid fight (the fight accessed from the beach anyway - the first encounter at the top of Terra Tower is actually pretty rockin').

Hey, they warned you about that in its name! :P I've never actually fought the Time Devourer, as I never managed to get out of Fort Draconia alive.

Doesn't Sephiroth go down pretty easily if you have the Knights of the Round Table summon?