Drawmij's Instant Exit

You open an extradimensional door in a wall or other flat surface that remains open for one round. When the door closes, you and anyone else who passed through the door are teleported to a completely random location within 250 yards. You will be let out at ground level, but there is no guarantee that you will be placed somewhere safe. There is also a 5% chance that you will instead be deposited onto the ethereal plane.