Demiplane Creation

You create a shadowy door on a flat solid surface that you can see within range. The door is large enough to allow Medium creatures to pass through unhindered. When opened, the door leads to a demiplane that appears to be an empty room 30 feet in each dimension, made of wood or stone. When the spell ends, the door disappears, and any creatures or objects inside the demiplane remain trapped there, as the door also disappears from the other side unless the same ritual on that side of the door. The demiplane is yours to design, the starting size is 300 cubed ft. When made the caster has direct access to the demiplane and has direct control over it. The caster has direct control over the way this demiplane acts in reference to time, gravity, and weather and the sort. The caster can summon up 75 unseen servants of their own design(appearance). The terrain of this plane is up to the caster and it can be expanded by 300 cubed ft. by casting the same spell inside the plane as a ritual spell, the only use of this spell as a ritual is to expand the interior. If the doorway if left open without the caster inside of the demiplane it will close after ten hours.