The Stone Mask is an ancient ritual mask with the power to transform humans into vampires.
The mask, once crafted by a certain Vampiric cult within Aztec society, was used by ancient Aztec civilizations, but they vanished mysteriously.
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 within a primitive 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 the vampire cult's leader, in order to become the ultimate life form. However, the masks did not worked on superior beings like them, only working on humans. It needed a perfect jewel (such as the Red Stone of Aja) to catalyze 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.
- As one of the most famous items in the series, the Stone Mask has appeared in several JoJo's Bizarre Adventure games:
- In Heritage for the Future, as part of the "Stand Crush", when one of the players has their Guard Gauge broken by the opponent, the Stone Mask briefly appears on the screen.
- In Phantom Blood (PS2), before every match begins, the Mask gains life for a short time and its tentacles comes out, announcing the episode start.
- It appears in All-Star Battle as the representing item for PART I arc in several trailers and Story Mode.
- Various games in the Castlevania franchise have an item called Stone Mask (sometimes called "Jade Mask"), which, according to in-game descriptions, were used in ancient rituals; a seemingly clear reference to JoJo. Appropriately, vampires are a central element of the Castlevania universe.