Per 
Item: SCP-ACBD
Object Class: Keter
Special Containment Procedures: SCP-ACBD is to be locked off by a 1ftx5ftx3ft (from outside) left sliding door. Only Class-D Personnel are permitted to go into it, approved by 3 Level 4+ Personnel No one is allowed to enter SCP-ACBD. It is to be suspended at least 5 feet off of the ground at all times using 10 extremely strong electromagnets and should have 5ft of clearance of all surfaces. It is stored at Site [REDACTED].
Description: SCP-ACBD is indestructible and measures 20ftx6ftx20ft on the outside, but on the inside it measures 5ftx5.5ftx5ft. Upon entering any door, you will be greeted with 3 doorless doorways. Upon entering a doorway, you will seem to phase through the door(to an observer,to you the door isn't even there) corresponding to the one inside the room, and you will retain this property until you have fully exited the door.
Over the course of 10 days after going through SCP-ACBD, you will slowly become insane, forget how to count, forget the order of the alphabet, and speak an unknown language which, despite all attempts, cannot be translated, as it seems to change every time any personnel goes through SCP-ACBD. The time it takes gets cut in half for each time you go through, going from 10, to 5, to 2.5, etc. After said time you will be classified as SCP-ACBD-1. You will lose all control over your own body and start entering a unending state of rage after 5 days(which is not affected by going through SCP-ACBD multiple times), and after the 10 day period, become impervious to all external damage, but will die after exactly 1 year. This was proved when, while fighting off an instance of SCP-ACBD-1, a soldier threw a small bomb into SCP-ACBD-1's mouth, killing it. This tactic has been used to kill any instances of SCP-ACBD-1 that were not going to be used for testing. While there is an instance of SCP-ACBD-1 existent, the door on SCP-ACBD will seem to lock by itself, if it is open, it snaps closed with no noise. If someone witnesses the door snapping shut, they instantly become an instance of SCP-ACBD-1.
