Curtain Wall

A Curtain wall is an extra dimensional room that is forty foot square and ten foot high. It will contain anything that will fit through the ten foot square door. The possessor of the curtain wall can shape the interior with boxes, separate rooms, tubs, or any shape that can be formed within the existing walls. Hardware cannot be made. You can have walls, but not doors with hinges. A tub can be made, but the possessor must provide the water and the means to get rid of it. Everything must fit in the 40x40x10 area. No sunken tubs. 
The door when open appears as a two dimensional curtain (hence the name) it can open from either side depending on the will of the possessor. Only those the possessor wills can enter a Curtain Wall. Anyone can exit. The Curtain Wall must sit on a firm surface and have sufficient room to fit the 10x10 foot area.
The Curtain Wall can be opened, entered closed and reopened in any location the possessor has been to. It cannot cross planes. However it will follow the possessor to what ever plane they are on. 
Primal Curtain Walls are even larger, 240" square and 20 foot high.
==Getting a Curtain Wall==
There are two ways to have a Curtain Wall. The first is by ritual. This is available to arcane casters as a ninth level spell of great cost. It is a natural ability of Earth casters, at least from Greyhawke. Last it can be held within an item.
A person is limited to possess one Curtain Wall, if two are held, neither will work. Someone with a natural Curtain Wall cannot use a gem Curtain Wall. They can make one.
Craft gain access to the Curtain Wall at 17th level.
Arcane casters can gain a curtain wall with a spell and $250,000.00 worth of material components.
The Curtain wall gem can be manufactured with the same spell for $500,000.00. It requires an opal worth at least $100,000.00.
==Usage==
Two such gems are in use at the Gate to Greyhawke. They are held by Avils and are the superior primal type. The gens are the size of a patter, and beyond price. They are minor artifacts, the only two primal gem based curtain walls known. The curtain walls are loaded with items and people prior to the "Gate Hour" and unloaded on the other side. One each side of the Gate.
Category:Magical Artifacts
Category:Supernatural