I see a lot of people who just cover models with the stuff. You are entering a massive world with a big community. Thrallbands form the core of the Thousand Sons war assemblies, led by a Magister Templi (a minor Chaos Sorcerer) or in rarer cases, a more powerful Sorcerer or even an Exalted Sorcerer. A timeline in The Horus Heresy Book Two - Massacre lists two events as
, with the Space Wolves Legion listed as taking part, in 965 and 969.M30. In The Regimental Standard, a copy of the The Imperial Infantryman's Uplifting Primer section of medical treatment of a lasgun wound was mistakenly replaced with a concise history of the Rangdan Xenocides, including direct mention of the unknown Legions fighting alongside the Solar Auxilia during the campaign. The second biggest advantage is that there are so many armies to choose from with so many unit choice that pretty much anyone will find something to suit them. Because there was no warning, the invading fleet translated from the Warp into realspace practically on top of the planet, and quickly destroyed its orbital defences, initiating the great campaign of the Horus Heresy known as the Fall of Prospero to Imperial historians. Within a few standard years Angron's fame had spread to every corner of his homeworld. Manipulated by the Warmaster Horus, who was already plotting his rebellion against the Emperor, the Space Wolves fell upon Prospero as savage barbarians, unleashing their bestial anger on the Thousand Sons and all of their works. The chair backs were draped with banners, while the great seat, at the head of the long table, was draped with the pennant of Terra. These icons have various and often simultaneous meanings, with some denoting the Aspiring Sorcerer to whom a Rubric Marine is enthralled, and others recording a lost piece of Prosperine lore. Isolated from the most common Imperial travel lanes and boasting virtually no independent resources of any value, Prospero had only one redeeming quality: it was a good place to hide. The peril of it is obvious. Magnus and Leman Russ took part in a devastating duel in which Russ was ultimately victorious. Their gene-seed was first derived from samples of the psychically-gifted DNA of their genetic father Magnus the Red and then implanted into the first Thousand Sons Astartes in the gene-laboratories of Luna during a brief resurgence of Warp Storms within the boundaries of the Sol System. The exact records of the Emperor's intervention and Angron's acceptance of his new situation is a matter of shadowed rumour and conjecture, but what can be said with certainty is that Angron's first reaction to his new situation was rage.