i've been through the castle enough to play blindfolded. but, i've never been able to do the royal chapel bat thing. what lvl does the sword familar need to be to do the spell? is level 53 enough? anybody know the combination to do it?
If you've already beaten the game, you can buy the Duplicator from the librarian and you should also have found a Power of Sire. Equip both and head to the Inverted Chapel to the room with the Spectral Sword, now quickly enter and reenter the room while using the Power of Sire to quickly rack up EXP for your familiars.
For 37 levels it will only take a few minutes. And if you don't have the money for the Duplicator I'd suggest to use the Sword Brothers glitch at the librarian (look it up in the Cheats section if you don't know about it).
He's leveling up so he can DO the Sword Brother's glitch.
No. The Librarian money trick and the Royal Chapel glitch are two completely different things. You can do the money trick as soon as you have the MP to cast Sword Brothers, but for the Chapel glitch the Sword Familiar needs to be at least L90.