Per 
Item #: SCP-████
Object Class: Euclid
Special Containment Procedures: SCP-████ is to be kept in a 25 meter steel cube lined with high voltage electrical wiring and tempered glass at all times. The door to the chamber is to be kept electrified with 1 megawatt of DC power as long as SCP-████ is in containment. The entrance is to be monitored via security cameras at all tile within the 5 by 7 ft hallway leading to and from the chamber. All D-Class personnel are to be searched for any items that were not permitted by the foundation before entering. Any corrosion detected in the glass walls, floor or ceiling are to be reported immediately to the nearest level 3+ access staff available. In events of transfer, SCP-████ is to be sedated with a mixture of neon gas and a vaporized version of SCP-999's slime from 5 gas jets located at the ceiling of the chamber.
Description: SCP-████ is a 6'3 foot tall creature with a humanoid stance. The creature is unnaturally lanky with extremely long limbs. The head is extremely long, extending 1 foot from the neck, covered with rib-like protrusions. Although multiple areas mimic bone structures, muscles and skin, SCP-████ only consists of a malleable, corrosive, black semisolid with an unknown chemical structure. The material that SCP-████ is created from gains a stronger acidic property when vibrating at high frequencies. SCP-████ has the ability to create blades from it's wrists that vibrate 500 times per second, causing the substance that SCP-████ is made up of to gain a higher corrosive ability. SCP-████ was found in ████, Tennessee at approximately 20:32 as a research team, hereby referred to as team Alpha, were investigating multiple sightings of a black humanoid stealing metals from multiple locations. While investigating, team Alpha located a small cave entrance leading to a cave which was covered with alien technology and many branching hallways. Along the floor were many creatures made of the same material as SCP-████. SCP-████ then emerged from one of the many tunnels and was subdued with no casualties. SCP-████ can mimic the form of any creature or object via a sample of any size. When assuming the form of an object or creature, SCP-████ cannot mimic the color of the material. SCP-████ has the ability to reshape itself in ways to weaponize whatever form it takes. SCP-████ cannot retain a form for more than 15 minutes without receiving a new sample, it can also cannot "remember" a form after it changes into a new one. Although it retains some traits from each form it takes for weeks after it loses the form. SCP-████ has rude attitude, and will consistently use vulgar language against site staff when they attempt to speak with it.
Addendum 1, Attitude Change
SCP-████ is subdued and sedated using anesthesia, which has a notably weakened effect.
SCP-999 is transferred from it's containment and placed in testing chamber A-12 with SCP-████
SCP-████ slowly wakes up, noticing SCP-999, it then takes a notably animalistic stance against SCP-999, growling even.
SCP-████ questions the situation, to no response.
SCP-████ gets frustrated with SCP-999's attempts to move to it, as it attacks viciously.
When the SCPs collide, they instantly run from each other, screeching in pain.
SCP-████ begins to start smoking and it's heat signature raises dramatically, it then falls over, losing form.
SCP-999 began to spark and burn as the bite mark it gained from SCP-████ begins to turn black and dissolve the surrounding "tissue" around it.
The test was then terminated, both SCPs completely recovered within █ weeks.
