Nemas the Arbiter

Nemas the Arbiter was one of five ghostly paladins that spawned outside the Alonsus Chapel in Stratholme during the final part of True Masters of the Light (3), the charger quest for Blood Knights. He — along with his four compatriots, as well as Aurius the Chapel's "keeper" — must be defeated into order to complete the quest.

As a quest objective
He must be killed for True Masters of the Light (3).