Anti-possession potion normally used on weak possessions, added to Carl's dose to send him into the spider's memories.
Mordecai combines Removal Order with Carl's dose of Glory Bound so that Carl visits the memories of Shi Maria instead of his own — a use he admits is untested, adding only "I hope." Bucket Boy immediately questions whether a potion meant for weaker possessions can work on an entity that powerful, and asks whether Carl's head will explode if it misfires; Mordecai's answer is "No, his head won't explode. Not the way we're doing it. Probably not."
Inside the shared dream the potion is what gives Carl the option to lock the spider permanently inside her own worst memory. Success would leave the tattoo on his chest but under his control, and grant him a skill or two. There are no instructions for how the locking works — Mordecai says it manifests differently every time but should be obvious. Failure means waking up with a furious entity still riding him and no second chance.
A potion added into the jar of fizzing green Glory Bound gel before application.
The mechanism that redirects Carl into the spider's memory and lets him imprison her there.