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Item #: SCP-xxxx

Object Class: Euclid Keter (see incident xxxx-a)

Special Containment Procedures:
SCP-xxxx is located within the ███████ mountains of ████████, Japan. The entrance to
SCP-xxxx is disguised to appear as an ordinary mountainside consistent with the surrounding terrain. Those entering and exiting SCP-xxxx must open and close all security gates individually
so that at least 2 gates are closed at any given time. Surveillance of the entry room is to be monitored at all times and if SCP-xxxx-1 is sighted no less than 10 D-class personnel are to be deployed to force SCP-xxxx-1 further back into the cave.

Due to the events of incident xxxx-a, entrance to SCP-xxxx requires approval from O5-██. See Document xxxx-1 for additional instructions.

Description:
SCP-xxxx is a cave of unknown size and age, although certain structures within SCP-xxxx have been revealed to date back as far as 3200 BC. SCP-xxxx is composed of areas that will be referred to as "rooms", do to the memetic properties of SCP-xxxx, each "room" varies with each expedition, with the exception of the first or "entry room", the "checkpoint rooms", and what is assumed to be the "final room".

All rooms share the similarities of being approximately 15 x 15 m, at a height of 7 m, with a 3 m raised perimeter protruding 4 m from each wall. On top of the perimeter there are 4 stone door frame's at the center of each wall. The entrances to these frames are completely black, and until passed, the other side can not be observed. No known light source has been able to illuminate them. At the center of the entry and the checkpoint rooms are obelisks of an unknown black substance. When observed, text of the observers native language will appear. For the entry room the text reads: beyond 5, to the end, before 50. For the checkpoint rooms 2 numbers will appear. Tests have shown the top number to be the number of checkpoint obelisks seen since entering
SCP-xxxx, the bottom is the number of rooms entered after the entry room, to include the checkpoint room currently occupied.

The final room is unique in that upon being entered the floor is completely flat, as opposed to the 2 level floor present in every other room, and the only door frame present is the one that was entered from. At the center is a hollow structure in the shape of a frustum. Within the structure is SCP-xxxx-1. The location of SCP-xxxx-1 can no longer be determined and every attempt should be made to keep it contained within SCP-xxxx.

When the entry room is accessed SCP-xxxx's memetic properties start to take place, those who entered will begin to express heightened curiosity of SCP-xxxx, stating that there is something there, often to be of incredible value. After entering one of the door frame's in the entry room the next room will either be a checkpoint room or a room of varying appearance, if going back through
the door frame previously entered, the entry room will be on the other side. Tests have shown this to be case no matter what combinations of paths nor how perceptually far one gets from the entry room. Upon entering the 5th checkpoint room the subject will enter a state of elation, expressing that they "are so close", then proceed to run toward the nearest frame excluding the one entered from. repeated tests have revealed that no matter which frame is entered at this point, it will always be the final room. As subject enters the final room they will immediately take notice of the structure, and cautiously walk towards it, and once entered will "see" what they have been looking for, and comment on it as their greatest desire. When under video surveillance nothing is seen and the structure is completely empty.

The subject will then attempt to take the object. The moment this is done SCP-xxxx-1 appears from where to object was taken. SCP-xxxx-1 is a formless entity approximately 1.5 meters in height and .5 meters in width. It's composition appears to be made of a thick black smoke.
SCP-xxxx-1 will then phase into the victim and [DATA EXPUNGED] the subject, this process takes in between 2-7 seconds, depending on the size of the victim. SCP-xxxx-1 will then seek out all other humans in the room, reaching speeds of ██kph. If any humans successfully exit the room, instead of returning to the entry room, it will be a random room. At this time SCP-xxxx-1 will enter a "berserk state" instantly [DATA EXPUNGED] all remaining humans in the final room and then attempt to find the subject which will now be referred to as SCP-xxxx-2. In the state SCP-xxxx-1 becomes incredibly fast, capable of going through rooms in under a second. Once both SCP-xxxx-1 and 2 have entered to same room, SCP-xxxx-2 is [REDACTED] and SCP-xxxx-1 exits it's berserk state, and wanders through rooms in a aimless manner. If however SCP-xxxx-2 manages to return to the entry room SCP-xxxx-1 becomes instantly aware of this, and backs to the previously entered door. Note that this in the only time that SCP-xxxx-1 has shown to be able to do this. SCP-xxxx-2 will then [DATA EXPUNGED] and both will disappear.