Khamalkhad L18

As you advance in level Rohrkhad and Khamalkhad are pleased. At level 18, gain the following Properties:

Critical: +5d6 damage

Aura of Thunder:  Once a day, as a free action, the wielder can call forth a blast of thunder.  Any enemy within 5 ft takes must make a DC 16 Con save.  On a failed save, a creature takes 3d6 thunder damage and is knocked prone.  On a successful save, it takes half damage and is not knocked prone.
Healing:  Once a day, as a free action, you can roll a hit die and heal for the result.
Special:  You now have a clearer link with Rhorkhad.  On occasion, you can ask for prophetic advice or guidance, and Rhorkhad will listen.  Whether he answers or not is a different story.