SCP-427 is a small, spherical, ornately carved locket made of a polished silver material. The ornate carvings do not seem to serve any function; it is unknown whether SCP-427's outer casing was crafted by sentients or not. Its circumference at its widest point is roughly 3 cm.
SCP-427 was created after placing a pill of SCP-500 in the Input booth of SCP-914 and using the Fine setting. It displays no unusual activity when closed. When opened, a small glowing orb is visible at the center. The orb emits no radiation or energy aside from the visible spectrum.
When SCP-427 is opened and exposed to biological tissue, it rapidly regenerates cellular damage and somehow is able to purge invading compounds or infections. As a standard of measure, the common cold takes 3 to 10 days to be worked through the human immune system and eventually removed. In the presence of an opened SCP-427, this time is reduced to 2 to 4 minutes. Its healing abilities are directional, so anything not in line of sight with the central orb experiences no effects.
However, long-term exposure produces a significant health hazard. As the locket heals damage, it optimizes the body's natural systems. Resistance to disease and toxins is increased by 500% compared to accepted LD50 or death-rate values after a total of 10 minutes of exposure, and 1000% after 15. After 15 minutes of exposure, muscular systems begin optimizing, increasing strength and pain tolerance by 200-300%. All other systems continue to optimize. Class-D personnel exposed to the device for over an hour total began mutating into a shapeless mass of tissue. The conversion time accelerates with continued exposure to SCP-427.
True to the source material, SCP-427 can be reproduced by placing an SCP-500 pill into SCP-914 with the setting on "Fine". When worn, the stamina gauge drains slower and replenishes faster, and the player gains increased movement speed. After wearing it for about a minute, a message will appear saying "you feel refreshed and energetic.". After two minutes, another message will appear saying "You feel gentle muscle spasm all over your body", accompanied by gurgling sounds. After three more minutes, a message saying "Your muscles are swelling. You feel more powerful than ever." appears and the vision gets blurry and the player starts randomly dripping a pale brownish liquid. If kept worn for thirty additional seconds the player gets in a state similar to crouching accompanied by the message "You can't feel your legs. But you don't need legs anymore". After a few seconds player dies, displaying a unique death message that says "Requesting support from MTF Nu-7. We need more firepower to take this thing down."