Collect 3 lion rings, via quest for the lion ring, and say lion rings, then yes to Mordenthal, located in his temple, in the Mountains north of Stonecrest.
Note: You must be misaligned to complete this quest!
Gain :
In total, 1 reward will have cost you 1125 Scalps of Moon Tug (that is 375 Scalps of Moon Tug per lion ring)!
You can complete this quest at will.