Source: Wolfsbane

Ceramite exploded into smoke. Slivers of the metallo-ceramic peppered his face. Russ armour' was that of Elavar, an
andent design imbued with arcane defenses. Its machinery responded to the damage, bathing Horus in a field of deadly
cold, but the Warmaster was unaffected, and he twisted his gauntlet back and forth, working barbs on his claws like saw
teeth deeply into Russ' arm. The Wolf King gritted his teeth against the pain.