Suicide bomb:
Rapidly tap X, Circle to fill the glove power bar until it explodes.

Thin or invisible characters:
Make sure you have the Armageddon magic equipped and select the Warp level. Stand next to a teleporter, use Armageddon, then step into the teleporter. You will come out either as thin as paper or invisible. Note: If this does not work first time, try it standing next to one of the other teleporters or enter at a slightly quicker or delayed time while Armageddon is in action.