Raddagoth is a Boss in Divinity: Original Sin.
Raddagoth is encountered sunbathing on the Secluded Beach just outside Evelyn's Secret Lair. Despite being a Sourcerer, he claims he has not used Source magic in years, content to enjoy his retirement on the beach. The Source Hunters can decide whether to kill him for being a Sourcerer or leave him alone.
Upon reading the Reveal spell to uncover the entrance to Evelyn's lair, Raddagoth (if the Source Hunters haven't killed him) will try to convince the Source Hunters not to go in, revealing that he was hired to guard the entrance but would prefer relaxing on the beach. At this point, he will become hostile unless the Source Hunters can persuade him three times in a row to let them pass.