Hidden Bastion

You create a door that leads to an extradimensional space. The door must be placed in an existing wall or other surface, is 8 feet tall, 4 feet wide, and can otherwise have any design you wish, or can look like nothing more than a faint shimmering in the air. At your discretion, the door becomes invisible when closed. The design of the space beyond the door is up to you, occupying a maximum of fifty 10-foot cubes with your choice of mundane furnishings, entertainment, and other amenities. The bastion regularly produces enough food to feed up to 20 people per day. While you are in the bastion, you are treated as being on a different plane from anyone outside the bastion for the purpose of attempts to contact you or divine your location. The bastion lasts for 1 week. Any objects created by the bastion vanish if removed from the space, and the bastion deposits any other creatures or objects outside its door when the ritual ends.