The Plum Door is a door you can build (the Dusk kit).
In-game description
An arched plum door with a brass ring knocker. E opens and shuts it.SHOWN IN THE BUILD RING
Building it
It costs 4 
Wood, 1 
Ghostcap, 1 Water 1 Earth 1 Wind spirits. It needs 2 Jewels first. Take it down with DISMANTLE to get its cost back (see Building).
