- War of the Beast (544-546.M32) - The Legio Decimata is known to have taken part in the War of the Beast, a massive Ork WAAAGH! of extraordinary size that threatened Terra itself. A greenskin invasion on this scale had not been seen since the Ullanor Crusade during the latter years of the Great Crusade. The Legio Decimata played a vital role in aiding Imperial forces during the third invasion of The Beast's homeworld of Ullanor.
- Deus Domitor (Unknown Class)
- Divinitata Excelsii (Unknown Class)
- Imperator Ultimatum (Unknown Class)
- Princeps Senioris Grimaldi - Grimaldi led the forces of the Legio Decimata forces during the Third Invasion of Ullanor in the War of the Beast.
Not listed in current Imperial records.
The badge of the Legio Decimata is not listed in current Imperial records.
- Shadow of Ullanor (Novel) (The Beast Arises Series: Book Eleven) by Rob Sanders, Ch. 9
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