I have 2 suggestions:

1. Maybe instead of just drones, mining lasers can be added to the body of the exocraft. These lasers would not have any elements so are not weak or strong against anything, but guardians will attack the exocraft itself when attacking because of damage.

2. The leviathan is a boss that drops various loot, including cargo holds, parts and other stuff. One thing it doesn't drop, though, is its own versions of drone technology. After all, it has its own parts, so why not drones? (Note: please make those stronger than regular and exclusive drones because of the trouble required for defeating the leviathan)