The Hand of the Dragon and the Shadow of the Waste Walker
Human slaver chieftan
A human berzerker (Monster Manual, p. 163), with added ranged attack ability.
Croesus is the leader of a particularly powerful gang of slavers that infest the area around Altaruk. Ruthless, cunning, vengeful, and oppurtunistic, he looks kind of like a post-apocalyptic Bruce Willis.