Were you looking for Vanny, the former user of this mask? A strange mask left behind by some Faz-TechnicianInfo The Security Mask is an advanced headset that allows the wearer to interface with the Virtual Augmented Neural Network Integration unit, or V.A.N.N.I., usually used by Class V technicians. Cassie was given the mask by Mask Bot during her journey into the Pizzaplex to find Gregory. The outer part of the mask looks similar to the secret mask obtained from the Curse of Dreadbear minigame
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Idea regarding Security Breach DLC : r/GameTheorists