>>149441849
Their Core is what keeps Drones 'alive'. She suffered enough damage to temporarily stop working, but since it wasn't properly disposed off the OS didn't delete itself and after some time she rebooted and became a zombie. Probably stuck under dozens of drones and unable to escape, then after some time Tessa probably came by, pulled her out, fixed her and thats Cyn.
Im not sure, but I think normal drones have a core with stabilizers around it and some wires connected to the drone to provide power. Idk where the AI is stored, but its probably there as well.