The Grey Knights attacked the imperial held installations on Destino IV, swiftly overpowering the imperial guard garrison. The guard themselves called for aid, and the ultramarines responded, surprised but not entirely shocked by the invasion by the inquisition astartes. The loyalist space marines briefly made their objections to the astartes, but before they got a response the Grey Knights attacked. In a vicious engagement on the barren planet, the perilous nature of the warp in the Foramen claimed several Ordo malleus lives, as they lost control of their psychic powers. Despite these setbacks the Grey Knights overcame the Ultramarines positions and forced the loyalists to withdraw, surrendering the world to Cybixx and his “crusade”.
Inquisitor Hathek and sector commander Titus Luthor were appalled at the space marine chapters killing one another, and grew concerned over what would happen when the Lord of Ultramar found out, which he surely would. However, both the Ultramarines and Grey Knights rebuffed attempts from Luthor to mediate, while the Ordo Malleus demanded Hathek face trial by their own inquisitor Hector Rex. The situation engineered by Cybixx was rapidly spiralling out of control.