In the base game, after completing A Terrible Reaction, Sheldon should call you and say that he needs some help about something very important. The first mission should pop up on your map soon after. The DLC missions have a different artistic take on the cutscenes.
Just Cause 3 | Air, Land & Sea
Story Mission A-1: Suit Up
Rico and Sheldon will meet at the wreckage of a drone that just slaughtered dozens of Medician civilians. They talk about the make of the drone, which is from eDEN Corporation, which Sheldon is familiar with. He gives Rico an invention Dimah made, the Bavarium Wingsuit, which is equipped with weaponry and a jet for increased movement.
Follow a drone nearby (do not destroy it) until you find three excavator drones digging up Bavarium. Take out these drones and then head to the next location of excavator drones. Do the same to these, and eDEN Corporation will send a third type of drone to kill you. Reduce this one to rubble and then fly towards the marker on the map to discover that eDEN has a massive airship in the sky, probably powered by Bavarium.
Story Mission A-2: Taking Control
Note: Before you can start this mission, you must first liberate the province of eDEN Airship, located off the west coast of Insula Fonte.
Sheldon has important intel for Rico regarding the eDEN Corporation, but it looks like something is blocking the signal. Dotted around the airship are blue jammers. Take them out and Sheldon will tell you to get inside the airship.
Destroy the panel interface to open the hatch, then fall inside to reach an unusual garden. The Black Hand from Rico’s days in San Esperito are back to kill you, this time upgraded with Bavarium Splitters and tougher armor. Take them all down and Sheldon will tell you where to go from there.
Hack the access panel in the drone storage room. After it shuts you out, a giant spider mech on the ceiling will activate, accompanied by several Black Hand soldiers to defend the area. The spider mech should be your biggest priority. Once all are defeated, eDEN will talk to you once again and the mission will end.
Story Mission A-3: Severance
Note: In order to start this mission, you must first liberate the settlements eDEN Extraction Site Alpha and eDEN Extraction Site Bravo, located in Montana and Prospere of Insula Striate, respectively.
Sheldon finally tells Rico that the Agency funded an eDEN invention that pulls Bavarium out of the ground, except in a way that it is a highly negative impact on the environment. Time to break it before eDEN destroys Medici.
Around the pillars near the weapon are energy tanks that are fueling its Bavarium shields. Destroy them to disable it by using the Bavarium wingsuit to fly around and launch missiles.
After that will be stabilizers, which are the rotating pieces of the machine, moving around the core. Destroying those will open the vents on the machine, to prevent overheating. Take these vents out next.
Finally, once the machine is fully incapacitated, destroy it and head into the airship to find Eden.
Throughout the DLC missions, try to barrel roll to avoid missiles, and take out at least one of each drone, which should come naturally. Taking off from the water also gives you a trophy. If you need a video guide on how to do Like a Fish... in the Air!, the link can be found on the Misc Trophies page.
There are four new Gear Challenges, three of which are Flight Master, similar to Wingsuit Courses, and one is new, called Sky Terror. They all are actually fairly challenging and will probably require a few runs through.
Just Cause 3 | Air, Land & Sea Challenges
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