Cyrion - sketch
Cyrion was a member of the Night Lords. By late M41 he was under the warband of The Exalted and later Talos. A Psykerwho is among the few friendly to Talos, known as "The Soul Hunter", Cyrion himself was universally hated for his own psychic abilities.
This "curse" had caused him to age noticeably, something rare among the Adeptus Astartes.