Item from jojos-bizarre-adventure by Hirohiko Araki
A perfect gem that amplifies energy infinitely — the missing piece of Kars' Stone Mask, capable of creating the Ultimate Lifeform when combined with the mask.
The Red Stone of Aja is the Part 2 MacGuffin — the one object that can complete the Stone Mask and allow Kars to transcend the Pillar Men's vulnerability to sunlight. In Kars' hands, the completed mask would create the Ultimate Lifeform — a being with no weaknesses, capable of any biological function. Lisa Lisa guarded the Stone for decades, understanding that its destruction would be ideal but that it's too hard to destroy. Joseph's climactic battle with Kars revolves around the Stone — and its activation is what ultimately creates the Ultimate Kars, who is then defeated not by destroying the Stone but by Joseph's absurd luck launching Kars into space.
A brilliant red gemstone, roughly the size of a fist, that glows with internal light. Perfectly cut, impossibly beautiful. When Hamon or light passes through it, the energy is amplified and refracted into devastating beams. Lisa Lisa wore it as a pendant for decades.
Also known as: Red Stone of Aja, Super Aja, The Red Stone