Black Ops 6’s Zombies mode has a French castle for players to explore in Citadelle des Morts, and those who are interested in conquering the hardest challenges of all can engage in the Citadelle des Morts Easter Egg, which features a Main Quest for the core Zombies Crew of Weaver, Maya, Grey, and Carver. There are quite a few steps to this Easter Egg, and all of them have been laid out for players below.