By the time Venser reached Karn in the core of Mirrodin it was already too late. Melira cleansed the golem's body of the Phyrexian taint but she couldn't cleanse the golem's heart. Knowing his own life would soon be forfeit due to his increasing phthisis symptoms, Venser made the ultimate sacrifice. With his last remaining mana he gave his life and spark to Karn. Moments later Karn was released from the Phyrexian tyranny and mourns the loss of his friend briefly but turns to battle the Phyrexians, stating 'he still has a lot of work ahead of him'.