Nemeroth
Nemeroth was a Chaos Lord and leader of The Chosen of Nemeroth. Invading the Forge World of Graia through a Warp gate, Nemeroth aspired to ascend to Daemonhood. Though he would manipulate the Ultramarines 2nd Company under Space Marine Captain Titus into unleashing his horde of Chaos Space Marines, Daemons, and Heretics upon Graia, in the end Nemeroth was 'killed' by Captain Titus himself.[1]
It is possible that since Nemeroth was able to partially ascend, and since his voice was heard by Titus moments after he supposedly 'died', Nemeroth may still exist in the Warp as a Daemon Prince.[1]
Physical description
According to his information card from the Anniversary Edition of Warhammer 40,000: Space Marine, Nemeroth stood at 8'8" (2.64 cm) tall and weighed 1200 lbs (544 kg).[2]
He wore an imposing suit of Terminator armour, which was engraved with many markings and symbols representing his allegiance to Chaos Undivided. Further strengthening this was the tattoo of the iconic symbol of Chaos, the eight-pointed star, located on his forehead. Nemeroth also boasted dual Lightning Claws and appeared to wield powerful psychic abilities.