I built a ship in the Crafting section...and for some reason, when it's an NPC, it basically commits suicide by going to the ring of asteroids on the edge of the battlefield and starts crashing into them. And, of course, this makes the green cloud slowly kill it.
Now, I only have a guess, but I suspect that it has to do with the parts I used; maybe there is an alien race in the main game that is immune to the green clouds and gains power by harvesting the rocks...? And the parts I used drives the AI to do what it does?
Just a guess.
This is the ship: https://steamcommunity.com/sharedfiles/filedetails/?id=1380542125
Lemme know, eh?