The Zombies map "Ashes of the Damned" features the largest round-based map in Call of Duty history, with a main questline and numerous easter eggs. Players use a truck named Ol' Tessie for transport, which carries the Pack-a-Punch machine. To unlock Pack-a-Punch, players must retrieve T.E.D.D.'s Head from the Server Room at Janus Towers Plaza and install it on Ol' Tessie. Players can drive to Blackwater Lake to restore power by shooting orange pods off a Power Pump, then proceed to Ashwood for further objectives. Players can upgrade Ol' Tessie with the Abomination Beam after defeating zombies and collecting items. The unique Wonder Weapon, the Necrofluid Gauntlet, is obtained by defeating a miniboss named Uber Klaus and completing various tasks. Players gather six ingredients for a serum, which involves specific actions at different locations. They must find three keys to unlock a box in Ashwood, which rewards the DG-2 Turret Barrel upgrade for Ol' Tessie. Players solve various puzzles at different locations, culminating in a final boss fight against Veytharion, where they must utilize Ol' Tessie and strategic gameplay to succeed.