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Daemon Sniffer is a utility program which reveals the daemon on a mainframe device. It costs 0 PWR to use, and has a cooldown of 3 turns. Daemon Sniffer can be bought from some Server Terminals for 350 credits.
While Mask is active, Daemon Sniffer can also be used on devices which do not have daemons installed, in which case it reveals that the device has no daemon.