Equip Oozing Eye, Trembling Eye, and Thrilling Eye simultaneously in the relic slots, then go to the three-eye mechanism in Catacombs of Paris to activate the entrance.
Success signal：The entrance to Mammon's Lair is open.
Note：All three eyes must be equipped simultaneously; keeping them only in your inventory will not open the entrance.
Bring the silver coin to the Ferryman’s landing marked on the Catacombs of Paris map and wait for him to arrive. If you just teleported here, let the arrival dialogue finish first. Then speak to the Ferryman and advance the dialogue.
Success signal：Enter the reward scene for Ferryman.
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Mammon's Lair · Three-eye mechanism
Mammon · Catacombs of Paris