After the destruction of Prospero at their hands, the Thousand Sons have been long time arch-enemies with the Space Wolves chapter. They have tried several times to uproot and destroy the Wolves, ranging from a full-scale invasion of the Space Wolves' homeworld of Fenris to plots such as those spearheaded by the sorcerer Madox.
The Rubricae are warriors of the Thousand Sons Legion. These forever cursed Chaos Space Marines exist only as dust, entombed by power armour. Rubricae are automatons used by Thousand Son Sorcerers as bodyguards and enforcers
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.