The 10th Founding of Space Marine Chapters, also known as the Sentinel Founding, occurred during the latter part of the Mid-35th Millennium. Created amid dark times of the Nova Terra Interregnum - the time of twin Empires. During this dark time in Imperial history, the Imperium was split in two. Denouncing the High Lords of Terra, the Ur-council of Nova Terra claimed rule over the Segmentum Pacificus. This dark period lasted for nine centuries. Few records remain surrounding this Founding, which was believed to be created to try to counteract the rapid erosion and contradiction of the Imperium's borders during this period. The infamous Astral Claws were one such Loyalist Space Marine Chapter allegedly created during this Founding from an unknown genetic origin, although some sources differ on this. Their Chapter was specifically created to defend the Eastern Fringes of the Imperium of Man from any Chaos threats spawned by the massive Warp rift called the Maelstrom, in the region of the Ultima Segmentum appropriately called the Maelstrom Zone by Imperial astrocartographers.
Select 10th Founding Chapters
- Imperial Armour Volume Ten - The Badab War, Part One pp. 54-65