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The '''Sky Fortress''' (or "Skye") was a massive fortified gunship belonging to the [[Imperial Fists]] at the time of the [[Horus Heresy]]. Little is known about the Sky Fortress despite its important role in the [[Age of the Imperium|history of the Imperium]].

The Sky Fortress was once an orbital plate (known as Skye) that was the sole large platform to remain above Terra in the lead up to the [[Battle of Terra]]. Cannons were added to its frame, and it was kept in geosynchronous orbit to the West of the palace.{{fn|2}}  During the peak of the [[Horus_heresy#The_Siege_of_Terra_and_the_aftermath_of_the_Heresy|Siege of the Imperial Palace]], the [[Imperial Fists]] and [[Rogal Dorn]] used the Sky Fortress to make a massive move to reinforce the Palace defenses after the traitor forces broke through the Palace walls. After facilitating the redeployment of Dorn and his Imperial Fists, [[Titan| traitor Titans]] targeted the great ship, destroying it. The crew of the Sky Fortress piloted its final descent into [[Horus]]'s forces below. The impact detonated the ship's plasma reactors, creating a crater three kilometers across, inflicting heavy fatalities and searing eyes with the flash of its explosion.^{{fn|1

*^{{Endn|1}}:[[Horus_Heresy_(Artbook_Series)#Collected_Visions|Horus Heresy (Artbook Series): Collected Visions]], p. 359.*{{Endn|2}}: [[Duty Waits (Short Story)]]