Aja Mask

"I don't intend on being a warrior like Wamuu, nor am I an idle dreamer. I don't care what method I have to use, victory justifies any means."

- Kars, user of the Aja Mask

The Aja Mask (エイジャマスク) is a powerful artifact featured in the second part of JoJo's Bizarre Adventure, Battle Tendency. The mask was introduced as a combination of Red Stone of Aja and the Stone Mask. It is a mask that Kars used to become the Ultimate Lifeform and have immunity to sunlight, making him no longer a Pillar Man.

He modified the Stone Mask so that the Red Stone of Aja could be used to activate its powers.

Appearance
It takes the appearance of a usual Stone Mask but Kars's modification had let the Red Stone of Aja sit in the hole right where the forehead is.

Background
5,000 years ago, Kars, Esidisi, and Wamuu conducted experiments on thousands of captured humans with the Stone Mask, Kars eventually figured out how to conquer the sun with the Red Stone of Aja. He tried various Aja Stones but they weren't powerful enough, he then concluded that they needed to encounter the Super Aja in order to become the Ultimate Life Form. During his search for the Aja Stone, Kars kept the mask until he succeeded in finding the stone.

Battle Tendency
Kars takes the Red Stone of Aja from Lisa Lisa after defeating her, later as he is about to be vaporized by UV rays he reveals that he he is wearing the Aja Mask in last second, the UV rays activate the Mask and Kars becomes the Ultimate Lifeform. The Mask is destroyed in the process.

Mechanisms
The Aja Mask is merely a more powerful version of the Stone Mask, it is powerful enough to completely pierce a Pillar Men's skull and transform them into the Ultimate Lifeform.