Players can find and upgrade Ritual Items in BO6 Zombies for the Citadelle des Morts quest

In BO6 Zombies, players can collect four Ritual Items essential for the Citadelle des Morts Main Quest. These items include Otto's Horseshoe, Ra's Ankh, Raven's Talon, and Paladin's Brooch, which can be obtained in any order after completing initial tasks. To upgrade these Ritual Items, players must locate glowing circles and eliminate zombies nearby. Each item has a specific upgrade location, such as the Knights room for the Paladin's Brooch and the Undercroft for Raven's Talon. After upgrading, players can obtain Incantations by hitting chests with their corresponding swords. These Incantations provide elemental buffs and are necessary for progressing in the Main Quest. Players must also determine the correct order of Incantations using Page Fragments found in the game.