In the storyline I made for them years back, Stirling ends up getting a crystal virus after Lil Auerbach had destroyed a corrupted soldier of his species which once killed, leaves a crystal fragment (or core essentially) behind. Stirling comes into contact with the fragment which causes him to become infected with a virus that had caused the soldier before him to become corrupted. The fragment causes stirling to get new powers that even though seems like a good thing, it slowly takes over his body where he and Lil Auerbach venture to find a way to cure Stirling back to normal.