Deadlight stiffened again. “Apparently someone found a way to modify them. Not one of Harmony’s existing designs… I don’t really know the specifics. I haven’t been in the interior during any of the invasions, so I didn’t see it myself. But… the one who did it was a friend of mine from a long time ago. A geneticist named Distilled Wisdom. She did something to the maintenance system. Instanced herself into one of their bodies, so she could control them. Lots of ponies died. Her too, during the last invasion. That’s probably for the best.”