Stone Mask

Originally known only to a vampiric cult hidden within the Aztec empire, the stone masks were designed by Cars as an initial attempt to give his race the ability to withstand sunlight. However, they were "only" powerful enough to turn humans into vampires. The mask is triggered when it is touched by human blood. The mask will then extend tendrils of stone from its edges, piercing the wearer's skull and brain. The tendrils are meant to precisely find and trigger certain points in the brain in a fashion similar to acupuncture, and from there release the wearer's potential strength. This surge will give the wearer vampiric powers and superhuman strength, but also render the body unable to withstand direct sunlight (or, for that matter, hamon).