Cranio-necrotizers were small hand held 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 plexus' or Interplexing beacons, they could indeed be linked technologies given the Borg origins of the Wardens. (Away Team video game:)

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