Vandred
From Warhammer - The Old World - Lexicanum
Vandred the Majestic was a powerful and successful Chaos Champion of Slaanesh. Blessed with a lightning fast serpentine body and four arms, he was extremely deadly in combat, garnering the attention of the Everchosen of Chaos, Archaon. Who chose him as one of his great lieutenants.
Vandred's horde, fought throughout the Chaos Wastes for the glory of his god. He was ultimately slain by Styrkaar, another of the Prince of Pleasures favored sons. After he was slain the Everchosen confronted Strykaar, eventually allowing him to take Vandred's place when he swore fealty to the Chosen of Chaos.
Sources
Warhammer Armies: Hordes of Chaos (6th Edition)