It would be on Signus Prime that Meros would meet his ultimate fate. After Sanguinius was knocked unconscious by the [[Blood Thirster]] [[Ka'Bandha]], Meros took part in a strike team to destroy the daemons fortress, the Cathedral of the Marque. While the rest of the legion, save the handful in the strike force under First Captain Raldoron, were gripped by the [[Red Thirst]], Meros and his brothers fought through hordes of [[Daemonettes]] and [[Bloodletters]] to infiltrate the Cathedral. It was during the final confrontation between Sanguinius and the two head daemons[[Greater Daemon]]s, Ka'Bandha and [[Kyriss ]] the Perverse, that Meros sealed his fate. After Sanguinius threw Ka'Bandha to its death from the tower of the Cathedral, Kyriss offered the Angel a deal. The daemons, along with [[First Chaplain]] [[Erebus]] of the [[Word Bearers]] and [[Chief Apothecary]] [[Fabius Bile]] of the [[Emperor's Children]], had created a cursed artifact of pure rage, using the half dead body of Captain [[Tagas]] who was believed to have been slain on the planet [[Murder]] years earlier. Stripped of all that made him a Blood Angel, Tagas was driven mad with pain and rage and was the conduit for the rage that had consumed the Blood Angels Legion. Kyriss's deal was simple: Sanguinius need only step into the swirling vortex of blood and rage and allow his body and soul to be fully corrupted. In return, Kyriss would cure the Blood Angels of both the [[Red Thirst]] and the [[Black Rage]] forever. Seeing that Sanguinius was seriously considering taking the deal, Meros leapt into the [[Chaos]] realm instead, followed swiftly by Sanguinius. Inside the vortex, Meros refused to let his [[Primarch]] take the deal. Instead Meros cut out his own [[geneseed]] and offered it to Sanguinius before allowing the rage to possess him. Meros the apothecary was dead, and the '''Red Angel''' had been born. {{Fn|1}}