I dig this spell:

Antithesis 8th Circle
When cast upon a creature, the antithesis spell creates one exact copy of that creature within the spell’s range. The singular goal of this newly created anti-creature is the destruction of its original. Thus, were a wizard to cast antithesis upon a character, an exact copy of that character, equipment and all, would appear and immediately set forth to destroy its natural counterpart.

The antithesis creature will remain until it or the original creature is destroyed. Upon either event, the antithesis creature and all of its equipment will simply disappear.

Note: The copy created by the antithesis spell is in the exact physical and mental state as the original. Thus, were the original creature injured or depleted in spell power, the antithesis would also be compromised to the same extent.