Cursed Seal of Darkness

The Cursed Seal of Darkness is a Juinjutsu created by the cannibal cult from the Land of the Sun. They only managed to successfully implement it into the child of one of their members.

Usage
The Juinjutsu is a very powerful one, and grants many immense abilities to its' user; at the gradual cost of their sanity. When the cursed seal is active, it transforms the user into something that hardly resembles a human being–a true demon.

In this form, the user has tougher skin and bones, completely invulnerable to all literally projectiles, and most ninjutsu. It can easily withstand extreme temperatures, pressure and even electrocution without so much as a scratch. It also greatly increases the strength of the wielder to enable them to lift up to three to four times their weight, and easily create craters by smashing the ground.

The most terrifying ability it grants the user is the ability to reattach lost limbs, or seal up injuries quickly without any marks. This regenerative capability is also shockingly present when the Cursed Seal is not activated, making it all the more terrifying.