Red Stone of Aja

History
A perfect gemstone, sought by the Pillar Men in order to greatly focus sunlight; in conjunction with the stone mask, the stone would enable them to withstand sunlight.

About 2,000 years ago, this perfect stone was in possession of an unnamed Roman Emperor. Cars, ACDC, and Wham went after it, but were defeated and imprisoned by the Hamon warriors of the time.

The reason the stone was not destroyed to prevent them from using it was due to a legend passed down among Hamon users, warning that destroying the stone would make defeating the Pillar Men more difficult. The stone was passed down among Hamon users, eventually ending up in the possession of Lisa Lisa during Part 2.

Battle Tendency
During the final battles of Part 2, Cars was able to use the Red Stone of Asia to become the ultimate life form.