Well since this is turning into spam I suppose I'd better do something.
You load your entire party into the and fly to Kefka's tower. Land on the tower and split into 3 groups. Wander around solving puzzles until you reach these beautiful ladies:
Who look like this in battle:
(Bless my little hobbit feet, its the dark Lord of Mordor)
(Freya from FFIX's big sis)
(Yunalesca lookalike)
These are the last bosses that the vanish-doom trick works on so enjoy it while it lasts.
If no-one else wants to do the final battle then I'll do it tomorrow. If you want to do then go ahead.