Jigoku no Ken

The Sword of Hell is a one-handed sword, bound in the black flames of Amaterasu.

The exact origin of this blade is unknown, though it is apparent that it was likely forged by a high-level Uchiha, given the sword's construction.

Usage The Sword consists of multiple, seemingly fragmented pieces of metal, bound to the weapon's hilt through a variation of the Kagutsuchi technique. This allows the blade to not only hold it's shape as a sword, but also to change stretch and gain flexibility, letting it be used as whip as well. In addition to making this a more versatile weapon, the black flames of Amaterasu can be spread to anything this blade touches, enabling a glancing hit to potentially engulf the target in consuming fire.

However, due to the fact that the flames of Amaterasu do not burn forever, the sword must be occasionally 'recharged'. To do so, during crafting, a special mechanism was built into the guard of the sword, allowing it to convert chakra channeled into the weapon to Blaze Release. This lets a non-Uchiha recharge the sword, though doing so in this way requires a greater degree of chakra to fill it.

As with the regular usage of Amaterasu, the black flames of this sword have been shown unable to burn through chakra defenses, and spread slowly onto other surfaces.