Phosis T'Kar was the Captain of the 2nd Fellowship of the Thousand Sons Space Marine Legion during the latter days of the Great Crusade and the beginning of the Horus Heresy. As one of the most powerful telekines of the XV Legion, he served as the Magister Templi of its Raptora Cult. Phosis T'Kar met his ultimate fate during the Burning of Prospero, when the Space Wolves Legion, were sanctioned by the Emperor of Mankind to punish the Thousand Sons for the pursuit of sorcery.
ponders-of-a-necron-overlord: The Imperial Truth Horus Heresy Anthology Cover Illustration This is gorgeous! Imperial palace for certain. I wanna hear the dialog between the two custodes! “What do you mean we should have turned left ten minutes ago!?”
The Night Lords. Their Primarch was Konrad Curze turned traitor during the Horus Heresy, after which it fought its way across Imperial space in a bloody campaign that culminated with the death of Konrad Curze at the hands of an Imperial Assassin. Since the loss of their primarch the Night Lords have based themselves in the Eye of Terror and now operate as a somewhat fragmented terror force who seem to go to war only to slaughter or acquire material possessions.