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Cranio-necrotizers were small handheld devices used by the Wardens.
They had two uses; for small scale production and distribution of Warden nanites to spread the Warden presence, and as communications devices. Each cranio-necrotizer was linked by a subspace signal functioning much the same as Borg central plexuses or interplexing beacons; indeed, they could be linked technologies given the Borg origins of the Wardens. (ST video game: Away Team)