Panda you can always wear GTB on your GM and go to Amon Ra. You can walk over his pillars and they just disappear doing no dmg whatsoever.
As for Magic Crasher:
Quote:Magic Crasher (Skill ID# 365) iRO Name: Stave Crasher
Type: Offensive Max Level: 1
Increase SP Recovery Level 1
Required For: Gravitation Field
SP Cost: 8
Target: Enemy Range: 9 cells (unconfirmed)
Cast Time: 0.3 sec After Cast Delay: 0.3 sec
Effect: You do an attack that calculates damage using your MATK instead of ATK but is decreased using enemy's DEF, not MDEF. This skills overall damage is affected by cards you have in your weapon, weapon element, size and element of the target and it might miss depending on your DEX.
Without an element in your rod/weapon, Magic Crasher is reduced by using Ghostring and Raydric. If you use an endow, you bypass both of those. Magic crasher is like a physical ranged attack that uses your Matk instead of Atk. Then again I don't have a high wiz, what do I know
