Dark Changeling

The Dark Changeling, aka, SCP-1274
Class: Keter
The Dark Changeling appears as a tall, slender, teenage girl with dyed, cobalt, chin length hair, pale skin, and light eyes. She is approximately five feet, six inches tall, and 115 pounds. In her containment, approximately twelve feet high, and 600 square feet, you need the fluid "Demonium" to keep her from changing. When she escapes, she transforms into a tall, emaciated, dark grey demon at about seven feet, six inches tall. The fluid is often somewhat painful when it first enters her veins, and she'll try to escape no matter what. She is known to have extreme strength, and will break through walls to get out. Other than the fluids, you'll need gaming consoles, dark ritual books, a phone, and a charger in her containment. She will get bored and escape. When she escapes and sees you, she will kill you. The only way to prevent being murdered is to run, as she's a horrible runner and loses breath very quickly. A way to hear her coming, and prepare to run, is if you hear her singing. Her songs are either dark nursery rhymes, alternate versions of European folk songs, or often songs from metal bands. She has a smooth alto voice, and will try to lure you to her voice, but whatever you do, do not follow it.