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Also called the '''Primaris Lightning Strike Fighter''', its design dates back to the [[Great Crusade]] where it was created by [[Magos|Archmagos-Arbiter]] [[Sykosk Thule]].{{Fn|4}} Originating from the [[Forge World]] of [[Voss Prime]], the 'Strike' variant of the Lightning is designed for a fighter-bomber role. It is normally equipped with a potent armament of twin-linked [[Lascannon]]s and six [[Hellstrike Missile]]s or [[Rad Missile]]s.{{Fn|3}} The Primaris Lightning was mounted on three dual hardpoints. Each hardpoint mount can also individually carry a [[twin-linked]] [[autocannon]], a twin-linked [[multi-laser]], a common type of fighter used by the twin-linked [[Space Marine Legionmissile launcher]]s during the equipped with [[Great CrusadeFrag Missile|frag]] and or [[Horus HeresyKrak Missile|krak warheads]], two [[Sunfury Heavy Missile|Sunfury heavy missiles]], two [[Kraken Penetrator Warhead|Kraken penetrator warheads]], two [[Electromagnetic Storm Charge|electromagnetic storm charges]] or a [[Phosphex|Phosphex bomb cluster]].{{Fn|415}}

The Primaris Lightning was a common type of fighter used by the [[Solar Auxilia]]{{Fn|15}} and the [[Space Marine Legion]]s during the [[Great Crusade]] and [[Horus Heresy]].{{Fn|4}} It was equipped with a [[Chaff Launcher|chaff launcher]] and an [[Armoured Cockpit|armoured cockpit]] and could be further modified by including [[Augur|ground-tracking auguries]] and a [[Ramjet Diffraction Grid|ramjet diffraction grid]]. It could also replace its human pilot with a hard-wired [[servitor]] and a dedicated [[Cogitator|cogitator targeting array]] to better identify and target enemy vehicle weak spots.{{Fn|15}} At the time of its introduction, the aircraft represented a new paradigm in aerial warfare for the Imperium of Man, being powered by a forced-plasma ramjet drive and optimized for the most sophisticated munitions available. However the pattern proved extremely costly to produce and could only be handled by the most experienced pilots.{{Fn|4}} A degraded yet more easily operated and maintained version was rumoured to be under consideration just prior to the outbreak of the Horus Heresy, but was not introduced during the conflict.{{Fn|15}}