A Portal is a Necron starship weapon system that is mounted on Cairn-class Tomb Ships, Scythe-class Harvest Ships, and Jackal-class Raiders. Portals are vast stone gateways located within a Necron warship that act as extradimensional conduits for boarding enemy vessels. More precise than conventional Imperial Teleporters, they are most commonly used to flood enemy starships with a relentless host of Necron Warriors and swarms of Canoptek Scarabs.
- Battlefleet Gothic Armada, pg. 73