Pact of the Door

You gain access to a nearly featureless 20-foot cube of extradimensional space. As an action you can designate an entrance no smaller than 6 inches wide and no bigger than 7 feet tall to connect and form a passage to this extradimensional space, blocking vision through the entrance. Small entrances connected to the extradimensional space can stretch to allow Medium or smaller creatures and objects to pass through it. This passage lasts for an hour, until you create another, or you dismiss it (no action on your part).
Attacks and spells can't cross through the entrance into or out of the extradimensional space, but those inside can see out of it as if through a 3-foot-by-5-foot window centered on the entrance. While outside the extradimensional space and adjacent to it's entrance, you can spend an action to retrieve an item or creature stored within it.
Any creature inside the extradimensional space drops out when this ability ends.