Shriven

From Lexicanum

The Shriven were once workers on the Forge World of Fortis Binary, however they were corrupted by Chaos. They were described as elaphantine, with long, nozzled gas masks sewn into their faces. They wore rubberised green body armour and the protectiver garb of their former workplace. Their armour was decorated with eye-aching symbols of Chaos.

Sources

• First And Only (Novel) by Dan Abnett