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The Inceptors fought during the Macharian Crusade, but during the subsequent Macharian Heresy they came to blows with their former allies, the Doom Warriors over a matter of honour. In the Euxcine System they fought a long-running and protracted conflict under predetermined rules of engagement. They refused to end the conflict, and as a consequence the Minotaurs Chapter was dispatched to end it for them.
The two Chapters were caught unprepared and, although the Doom Warriors were able to escape the system, the Inceptors were stranded on Euxcine and were systematically destroyed until fewer than a hundred Space Marines remained. They were forced to surrender. Many of the Chapter's relics, including their flagship - a Great Crusade-era assault ship - were captured by the Minotaurs. The Minotaurs were subsequently denounced across Ultramar and forbidden from entering its boundaries. Other Ultramarine-descended Chapters have also sworn vengeance against the Minotaurs.
- 544-546.M32: The War of the Beast - The Inceptors aided the Ultramarines and their successors in defending Ultramar from the Orks.
- 1: Codex: Space Marines (5th Edition), pg. 8
- 2: Imperial Armour Volume Ten - The Badab War - Part Two, pgs. 107-109
- 3: Shadow of Ullanor (Novel), Chapter 1