This guide covers "The Maw," the final mission of the main campaign in Halo: Campaign Evolved, detailing where to find its hidden terminal and three collectible skulls. As in the game's other missions, players seeking full completion or gameplay-altering bonuses will want to track down these secrets while Master Chief and Cortana attempt to destroy the Pillar of Autumn after leaving the infected Captain Keyes behind.

The Arrival terminal is located against a wall in a fire-lit room reached early in the mission, near the Autumn's bridge. The Stowed Reload skull, which keeps weapons reloading while holstered, sits behind a cryo storage chamber accessible via a ramp and support pillars. The Boom skull, doubling explosion radius, requires a tricky route past several pistons and a squeeze through debris in the core-destruction area. Finally, the Thunderstorm skull, which upgrades enemy ranks, is found down a side tunnel during the closing warthog chase to escape the collapsing ship.