minor spoilers:- - - - - - - No kill all 8 elemental dragon boss's (skull + golden dragon are inside Kefka's Tower) once all 8 are dead you will unlock the Crusader esper (Meltdown x1 learn rate + Meteor with a x10 learn rate.)
omfg x10?! woah, and quick is better than meteor anyways imo. I'll still stick with Odin to make some magic characters learn meteor for the Cultist's Tower. thanks! --- Children in the dark cause accidents; accidents in the dark cause children :O
Crusader is gotten kind of late, bare in mind. It requires going at least some distance into the Final Dungeon, which while yes, you CAN leave, it still proves you have to do quite a bit.
You have to visit the final dungeon, 5 other dungeons, and a small little side area (Opera House isn't really a dungeon, since all that's there is Earth Dragon), so...you're basically completing most of the WoR as is to get Crusader.
So yeah, that "x10" isn't quite as amazing as it sounds considering how late it is. --- www.rpgdl.com The site Meeple argues at for too much of his life!
Well technically Crusader CAN be gotten as soon as you got the Falcon Airship which in turn I did kill all 8 dragons (though I still picked up at least 4 more party members) before fighting the Skull and Golden Dragons.