A two-target teleport trap swaps the person touching its mobile plate with Donut at the origin.
Donut mounts an emergency Loop-De-Loop on the red automaton. At her trap skill level, she can program it only for crawlers outside her party.
When a valid crawler touches the plate, that person and Donut exchange locations. Party members, mobs, or NPCs cannot activate it correctly and may cause an immediate misfire if they touch it.
Carl hides the red spider outside the Capitol as the fastest method for bringing Donut to him. A memory ghost's clothing briefly covers it without triggering the plate.
A red spider automaton carrying a two-arrow teleport plate, pressed flat against a wall under discarded clothing.
Loop-De-Loop is the Royal Court's emergency means of swapping Donut into Carl's remote location.
Also appears in books you've already read — spoiler-safe to their endings: