Spent many weaks trying to treat those who'd contracted the disease known as Crossout the cure was never found. Seen enough and heard enough from the dying people to lose his mind. Now he can hear voices calling for help and see things that are not really there (or the others somehow didn't notice them?). Now Mortus believes that life in general, and humanity in particular — is a disease that struck the Earth. And he does everything in his power to finally cure the planet.

The ambulance, that Mortus used to transport the sick and for many years, proved to be useful even after the disaster. Its appearance and purpose changed to suit its owner's new needs. This car has become a harbinger of death in the Wasteland, even noticing it from a far promises imminent demise. If the good doctor hears a call for help, he spares no one. So be quiet, no matter how much it hurts.