Donut's skill creates two temporary Sledge automatons used to trigger Lucia's teleport traps and deliver a fake Donut.
Donut casts Clockwork Triplicate on The Sledge inside the guildhall. Clockwork Sledge One crosses the first trapped threshold and appears among the waiting hunters, where it explodes.
Clockwork Sledge Two wheels Katia's crowned stuffed-animal decoy into the safe room. Lucia mistakes it for Donut long enough to activate her teleport spell, transporting herself, her dog, the automaton, and the decoy to Vrah's ambush point.
Two mechanical duplicate rock creatures modeled on Sledge's wheeled body.
The skill supplies expendable bodies for remotely probing both of Lucia's teleport mechanisms.
Also appears in books you've already read — spoiler-safe to their endings: