Stone Masks (石仮面 Ishi Kamen) are powerful ancient artifacts featured in the first two parts of JoJo's Bizarre Adventure, Phantom Blood and Battle Tendency. They were originally introduced as sacrificial devices used by certain Vampiric cults hidden within the AztecW Empire. Mounted ornamentally in the Joestar family estate by George Joestar I, one Stone Mask eventually transforms Dio Brando into a Vampire, extending his life, as well as his influence over a significant proportion of the series.