Karanak

Karanak is a Flesh Hound in the service of Khorne. Unlike normal Flesh Hounds, he has three heads which apparently allow him to track prey's trails in space and time, as well as their thoughts. Basically, if for some reason he decides to come after you you're pretty boned.

On the Tabletop

Khorne's other named herald. Karanak gets to reroll all to hit rolls and to wound rolls against a character selected at the start of the game, grants his entire unit rage (hilarious on Bloodcrushers if they can make it in) and causes any psykers within 12" of him to peril whenever they roll doubles. He has Scout, like every Flesh Hound.