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The Phantom Device is the Mistress of Mystery's tool for stealth and infiltration. To master it, the player needs to first gather the necessary ingredients.
- The player has to first access the Cryptos mainframe and learn of the components needed for crafting the device: A HalluciGen canister and a Stealth Boy. If the player already has these in their possession, they simply need to combine them at the fabricator in the Manor to complete the quest.
- Otherwise, they need to find them. The Stealth boy can be found at the North Cutthroat Camp, in a locked footlocker, while the HalluciGen canister is in the Garrahan Mining Headquarters, in the CEO's office, in her safe.