Door of Returning

You touch a door with a silver key, designating it as the anchor for the spell. A small, matching rune appears on the keyhole and the silver key used for this spell.

The key becomes a magic item and is linked to the anchor door. When you turn this key in another door's keyhole, you can conjure a portal that links it to the anchor door, even if it resides on another plane. Once opened, the portal allows one-way passage to the anchor door for 10 minutes, or until the link is severed by closing the anchor door. When the link is severed, the key vanishes.