Physicality: 519 is an estimated 70 inches in height and weighs 152 pounds. Skin tone is extraordinarily pale. Both toenails and fingernails are remarkably durable; also sharpened into points. Ears, eyes, nose, mouth, anus, and penis have all been sewn shut with tempered steel wire. While this has been documented as a procedure, or part of one, routinely performed in secret at aforementioned prison facility, 519 is only known subject to still be alive. However, 519 exhibits no discernible nor measurable heart rate, breathing function, or brain function. Further data on physical of SCP-519 to be compiled.
Activity: 519 displays remarkable dexterity, agility, and strength, each to an extent that matches or surpasses that of military-grade automated equipment (see attached descriptions of containment observations for examples). 519 provides no aural or olfactory stimulus; however, 519 has reacted to aural, olfactory, visual, and tactile stimuli. 519 has, thus far, attempted to terminate any conscious beings that enter containment area. When not restrained or sedated, 519 succeeds in rapidly terminating all entering personnel and other sentients, usually by means of massive and repeated separation of bone and tissue. 519 neither consumes edibles nor expels waste. When unaccompanied, unrestrained, and not sedated in containment area, 519 continues to scratch messages on interior containment walls in German, English, and Italian.