Tempestor Prime Gallus is the commander of the 81st Scion regiment. His forces were deployed in the second phase of the Charadon Crusade, where they took heavy losses in their initial engagements. He had major issues with Space Marines, seeing them as glory hogs and undeserving of their lofty status. The two were major factors in his choice to join Pavus' conspiracy against Lord General Kruger Zonand. After the Third Battle of Grimdi, he led his Scions into the Crion Crusade.