Necrons: Canoptek Wraiths

While a Tomb World slumbers, Canoptek Wraiths are its eyes and ears. Canoptek Wraiths flit silently through the dusty halls, patrolling for intruders and inspecting systems for damage and decay. Their most notable feature is their dimensional destabilisation matrix - a phase shifter that allows them to skip in and out of reality. While originally designed to allow a Canoptek Wraith to reach into and repair solid machinery, the dimensional destabilisation matrix is no less valuable when dealing with intruders. A Canoptek Wraith can phase its claws and tendrils inside an opponent, swiftly resolidifying them to sever arteries, nerve clusters and other vital pathways without leaving an external mark to show for it.