This lock can only be placed on doors of rooms with 500sq feet or less. The lock is opened with a pin code of digits 0-9 displayed on the front of the lock. Upon finding this item, one magical user may attune to the lock during a long rest. During attunement the user will set the 4-6 digit code to open the door. For each incorrect attempt at entering the pin code, the user will take 2d6 of arcane damage. and for each subsequent attempt 1d6 will be added to the base damage taken. This damage ignores all arcane and magic resistance. The person attuned to the lock will be notified mentally that someone is attempting to gain access.
This lock will shift the room held inside of the door to the astral plane. If the door is opened by force without use of the lock, only a small empty closet will appear. The room will maintain it's own planets atmosphere, thus food will decay at a normal rate, there will be oxygen inside, etc. This lock cannot be destroyed, and can only be attuned to a new user once the old one has died.
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