Helthar is a Nord member of the Bloody Fists found inside Headman Bhosek's palace. He is the guard of Bhosek's lockbox where the shipping logs are. The Vestige can test Neramo's special dwemer shock rod on him to disable him so they can access the box.
Now that the Vestige have recruited at least one of the people Kaleen wanted, we can pull off her heist whenever ready. The goal is to break into Headman Bhosek's palace and steal the shipping logs from his lockbox.