The Door Pathway is one of the 22 pathways of the Beyonders, ruling over space, movement, and stars. Its bearers open what is locked: from doors in walls to transitions between worlds.
The pathway begins with the Apprentice potion (Sequence 9) and leads to Sequence 0 — Door, an omnipresent entity for which any boundaries are but thresholds. Together with the Fool and Error pathways, it belongs to the "Lord of Mysteries" group.
In the era of the novel, potions of this pathway are considered the rarest: for the formulas of Door, secret organizations across the entire Northern Continent hunt.