Thurl’s main motivation and goal was power. He thought that, thanks to the elemental power of air, he could rule Waterdeep. Thurl pledged loyalty to Aerisi Kalinoth but only reluctantly, believing that one day he would use her and her minions to conquer Waterdeep.
Thurl did not tolerate insubordination among his troops, and did not hesitate to sacrifice disloyal soldiers to his manticore that roamed the Sighing Valley.
Thurl met his demise when he was pushed from the top of the spire by Redkin.