Stone Mask

The Stone Mask is an ancient ritual mask, used to turn humans into vampires. The mask was used by ancient aztec civilizations, but they vanished misteriously. One of these masks was kept by a noblesman called George Joestar. When his son Jonathan and his adopted son Dio Brando were fighting each other, both discovered that it was no ordinary mask. Jonathan became a archaeologist, and started to research the mask. Dio also secretly made his own researches on the mask, thinking it was a torture instrument. However he discovered the true nature of the mask the worst way possible, using it on a street thug, who turned into a vampire and almost killed Dio. Dio later used the mask on himself, turning into a vampire. After he was defeated, the mask was destroyed by Robert Speedwagon, who later founded the Speedwagon Foundation to find more about the Stone Masks and other artifacts. He found a ton of them in a mexican temple, along with a man bound to a large pillar, thus discovering the true origin of the masks.

The Stone Masks were created by the Pillar Men, especially Kars, who was their leader, in order to become the ultimate life form. However, the masks didn't worked on superior beings like them, only working on humans. It needed a perfect jewel to catalyse the sunlight in order to work properly on them.

The mask is activated by blood, which makes the mask extend large spikes from it's back and carve them on the wearer's head, activating specific points on the brain like acupunture, which release the hidden potential from the body of the wearer, turning him into a vampire with superhuman abilities.