You create a shadowy Medium door on a flat solid surface that you can see within range. This door can be opened and closed, and it leads to a demiplane that is a room that copies the immediate surroundings 30 feet in each dimension around the door at the time it was made. If the walls of the demiplane would stop in open space, it is an indestructible black barrier for a wall. At the time of casting, all creatures in range are immediately transferred into the demiplane.
The spell remains active for as long as the demiplane is occupied, up to 8 hours. The contents of the room are intangible, and will continue to mirror the area in which it was made. The room does not copy creatures or magical properties of items.
You may dispel the room at will. When it is dispelled this way, creatures inside the room are transferred into the world in the location they were in the room. If they are inside of an object or another creature, they take 6d12 Force damage and are knocked prone. Objects are destroyed. If Dispell magic is used on the door, each creature in the demiplane is immediately transferred to the world where they were in the room and are knocked prone. They each take 2d12 Force damage if the door was locked.
You may lock the door from the inside, however creatures can leave the demiplane through the door even if it is inaccessible from the outside.
A creature may make a Wisdom (Perception) check to detect the door. The DC is 12 + your spellcasting ability modifier. You don't have to make this check. The door is invisible while it is locked.
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