One with spikes that can burst into flame!
Doods.
You're doing it wrong.
It should have a hammer on one side
Axe on the other
And a spear head sticking out of the axe.
Able to spew acid, freeze shit to absolute zero, and ignite WITH THE FURY OF 3.1415 SUNS!
FOR ALL TYPES OF DAMAGE FOREVER.
Electricity and sonic, just from core D&D.
Also things like holy, infernal, dehydration, vile, and so forth from sourcebooks.
Also also earth, air, water, poison, blood, darkness, light, and so forth from other cliche games.
Also...
The day that Erden gains this weapon will be the day that he challenges the entire Academy to fight him.
They do not stand a chance.
*sends in an invulnerable guy*
OR
*sends in someone with a powerful ranged attack*
OR
*sends in a mind-controller*
OR, if you want to get boorish,
*sends in God*