The Ghostlight is a highly sophisticated targeting system utilised by the recently re-discovered Eldar Aspect Warriors known as the Shadow Spectres who specialise in the deployment of highly-mobile, infantry-based anti-armour firepower. Shadow Spectres are experts at striking at enemy vehicles from concealment and extreme long-range. Used in tandem with their powerful and potent Prism Rifles, this targeting matrix further amplifies the maximum effective range and lethality of their formidable weaponry. Additionally, Shadow Spectre Aspect Warriors are capable of combining the power of their Prism Rifles using the Ghostlight. The Ghostlight combines each individual shot from a squad of Shadow Spectres into a single searing blast of energy with a greatly magnified range that allows the Aspect Warriors to destroy an enemy's armoured support from an unseen location far across the battlefield. Instead of firing their Prism Rifles (or the Exarch's Prism Lance) individually, the squad may take a single Ghostlight shot of greatly enhanced power which is particularly useful when used against the most powerful armoured targets like Space Marine Land Raiders.
- Imperial Armour Volume Eleven - The Doom of Mymeara, pp. 138-143