"Just Cause 3: Sky Fortress is the first PDLC pack from the Air, Land & Sea Expansion Pass. Become the master of the skies with Rico's all new and fully armed, Bavarium Wingsuit. Save Medici from the threat of the terrifying Sky Fortress and its army of deadly robotic drones.
Sky fortress is a video game
A new enemy, the eDEN Corporation, uses the large eDEN Airship and a fleet of armed drones to invade Medici. They are in possession of futuristic technology, such as energy beam weapons. Rico has to defeat them.
This new faction uses specialized drones to mine Bavarium from Medici. Drones are ranged from usual extraction (mining) drones to armed drones, with missiles and machine guns, as well as ground drones with dual miniguns. Similarly, eDEN Corporation soldiers are seen with more advanced weapons and armor than those of Medici Military. Some drones have a Bavarium-shield.
Did you read the advanced technology PART? And the drones?