Stolla Crusade

The Stolla Crusade was a brief but bloody war fought on the fringes of the Scarus Sector of Segmentum Obscurus between the wrathful Seraphim of the Abyss Chapter and the Forsworn Warband, officially. However, there was a secret at the heart of the crusade, that being the aforementioned Unforgiven Chapter of Space Marines learning of many of Fallen Angels, traitor marines that betrayed the Lion at the end of the Heresy, joined forces with the fearsome Forsworn, dreaded heretics that revere the perfection of the art of killing led by a Champion of Slaanesh known as Arazar the Beautiful. The 4th Company of the Seraphim was dispatched to the Stolla System where the traitors gathered en masse, being the closest forces of the Chapter to strike. But as the Company Master Adelos Eremiel had been called elsewhere with his chosen veterans, it fell to Lieutenant Anris Balthiel who took the rank of Force Commander and led his brothers into the Stolla System with sacred armor lent by the Chapter's 3rd Company, including several Predators.

After entering System, the Seraphim were immediately beset by the dreaded Forsworn void fleet, that were already engaged with the small Imperial fleet defending the system from the Chaos Marines. Managing to drive the Forsworn away, the Seraphim marshaled the remaining Guard elements and slowly destroyed the ranks of the Forsworn, their Warp-induced mutation taking many lives of the Sons of the Lion, and the final battle took place over Stolla Secundus. Formerly a Fortress World of the Imperium, Secundus could not be broken by a conventional assault, so Anris Balthiel took personal command of a strike force that harassed and slew key targets across the planet, using an ancient teleportarium network discovered on the Dead World of Stolla Tirtius. Eventually, the defences of Secundus were shattered or disabled, and the Fallen finally revealed themselves at the heart of the Fortress World, where Anris and his strike force assaulted as the rest of the Imperium's forces besieged the holdouts of the Forsworn.

Upon entering the Fallen's den, several of the marines comprising Anris' force were gunned down by the traitorous Angels and a subsequent firefight took place, with the Seraphim under orders to not kill the Fallen, but simply capture them for their repentance. Commander Anris Balthiel sparred with the Fallen leader Barathiel with blade, the younger marine's prowess matched with the traitor's experience, but Anris emerged victorious with bashing Barathiel's head with the hilt of his power sword, and the Fallen knew they were defeated.