Mark seemingly kills Conquest but body is preserved

The finale of Invincible Season 3 features a climactic battle between Mark Grayson and the Viltrumite warrior, Conquest. After a fierce fight, Mark seemingly kills Conquest and orders his body to be burned. However, Cecil, the Global Defense Agency director, secretly preserves Conquest's body in a steel block buried underground. He plans to use it to extract information about the Viltrum Empire. Mark's experience changes his moral outlook. He admits to his half-brother that he is willing to use lethal force against threats to his loved ones. This shift may affect his future interactions with enemies and friends.