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{{Ambigredirect|subject=Warp navigation devicePharos|other uses of the term|Pharos (disambiguation=Pharos)}}

 It could also secondarily aid in Warp travel, being used to navigate the Warp much like the [[Astronomican]], except while the Astronomican utilized psychic power to provide a reference point and acted as a "lighthouse" in the Warp; , the Pharos utilized empathic energies and would illuminate the needed location, making it appear as a comparative "lantern", which would provide a path to where a ship needed to go. Due to using empathic power, instead of psychic, the Pharos' function was completely unhindered by [[Warp stormsStorm]]s.{{fnFn|3}}

The Pharos was discovered by [[Humanity]] on Sotha by [[Barabas Dantioch]] during the [[Horus Heresy]] and used by [[Roboute Guilliman]] as a beacon to attract scattered loyalist forces to his new empire, [[Imperium Secundus]].{{Fn|1}} The Pharos became the subject of battle when the [[Night Lords]] under [[Krukesh]] discovered the nature of the device and became determined to claim it in order to find the ''[[Nightfall]] '' and [[Konrad Curze]]. In the ensuing [[Battle of Sotha]], Dantioch overloaded the Device to defeat the traitors and its engines fell silent for the first time. Unknown to all involved, this act served to alert the [[Tyranids]] to our the [[Galaxy]].{{Fn|2}}

While Dantioch's sabotage destroyed the primary communications chamber, labeled designated "Primary Location Alpha", there was a less powerful secondary chamber labeled designated "Primary Location Beta". Guilliman used this chamber to contact Emperor-Regeant Regent [[Sanguinius]], after the Night Lords had been driven away from the planet. There was also a third chamber, labeled designated "Primary Location Ultra" far deeper into the mountain.{{Fn|2}}{{Fn|3}}

After the Heresy, Guilliman ordered the Pharos destroyed - removing thousands of tonnes of xenos machinery from the mountain and filling its tunnels with millions of tonnes of [[ferrocrete]]. The primarch appointed [[Oberdeii]] as [[Warden of the Pharos ]] and [[Space Marine Captain|Captain]] of the Aegida Company, sworn to protect Sotha from whatever secrets had been buried in the Pharos. This duty passed to 199th the Company of Ultramarines's successors, now their own a new chapter and renamed named the [[Scythes of the Emperor]] , after the [[Third Founding]].{{fnFn|4}}

Despite the attempts to dismantle the Pharos, the Necron technology of the Pharos activated its self-repair functions and quietly the Pharos facility rebuilt itself. Millennia later, the formation of the [[Great Rift]] reactivated the now fully -repaired and operational Pharos, which was noted by the now-reborn Scythes of the Emperor. [[Archmagos]] [[Belisarius Cawl]] led an expedition to study and perhaps use the Pharos to close the Rift and defeat [[Chaos]].{{Fn|5b}} Ultimately during Cawl's experiments he discovered that the device's core, a singularity, and it's its datacore, were both being contained by an enslaved C'tan shard of Zarhulash. Cawl tricked the shard into destabilizing the device's singularity, before using the Pharos to teleport the shard to an unknown distant [[System|star system]]. The destabilized singularity then began to collapse into a blackholeblack hole. However, Cawl was able to escape with the data stored within the Pharos, including the location of other Pharos and Blackstone deposits across the Galaxy. The Pharos device itself was destroyed by the combined firepower of an Ultramarines [[strike cruiser]], it'its [[escort]]s escorts and the Cawl's personal ship ''[[Zar-Quaesitor ]]'' before the destabilization could create a blackholeblack hole.{{Fn|5e}}

A '''Pharos''' is a [[Necron]] device which allows the Necrons to travel [[Faster-than-Light|faster than light]] and communicate over interstellar distances without relying upon the [[warp]]. In general terms, it is described as a ''Quantum Empahtic Resonance Beacon''. These beacons, such the one upon [[Pharos|Mount Pharos]], are believed to each contain an entangled supermass of isolated particles that are perfectly in tune with each other. These devices exploit the fundamental laws of physics to connect multiple parts of reality together.{{Fn|5c}} The beacon within Mount Pharos was powered by [[C'tan Shards]].{{Fn|5d}} When activated, the device creates a portal to a distant location in space that is keyed to the mind of its user.{{Fn|5e}} The beacon within Mount Pharos is only one of hundreds of similar devices (Pharoses), which form a network throughout the galaxy.{{Fn|5d}}

Besides its ability to act as an interstellar communication and travel device, each beacon is capable of tuning one's energetic state with their past emanations. In the case of [[Belisarius Cawl]], it allowed him to experience the pasts of his constituent minds, despite his dominant personality never recollecting them.{{Fn|5a}} Within the [[Pharos]] beacon, this phenomenon has been referenced in tales of "mountain dreaming", wherein one experiences visions of their past and the pasts of others.{{Fn|5c}}

*In ancient history, the [[Wikipedia:Lighthouse of Alexandria|Pharos of Alexandria, Egypt]] was an immense lighthouse of its time and one of the seven wonders of the ancient world

*{{Endn|1}}: [[The Unremembered Empire(Novel)]] pgs. 30–45

*5: [[Belisarius Cawl: The Great Work (Novel)]]: