Magic Weapon, Greater

Source magic weapon greater

You can add one of the following weapon special abilities to the weapon: flaming, frost, keen, merciful, shock, or thundering.

Augmented (5th): If you expend two uses of mythic power, you can reduce the granted enhancement bonus by 1 to add two of the above abilities or one of the following abilities: anarchic, axiomatic, flaming burst, holy, icy burst, shocking burst, or unholy.