Vol was the primary tactician responsible for orchestrating the Battle of Draetheus V, ignoring the Human-Covenant ceasefire treaty of 2552. Decimating the UNSC Navy in orbit before landing on its moon X50, Vol activated the moon which was revealed to be a powerful Forerunner artifact. The artifact began violently reconstructing the planet below, leading to a full UNSC evacuation.
During the final stages of the conflict, Merg Vol was hunted down and eventually killed by SPARTAN Commander Sarah Palmer in single combat at the foot of the artifact, the last human soldier remaining on the planet. His fleet met it's defeat and destruction throughout the course of the battle, his Remnant sect coming to an end.