Yoridai

Yoridai (依り代, God-Possessed Object) is the infamous blade wielded by Seven Ninja Swordsmen of the Mist member Murasaki. It's noted as one of the strangest blades in the world of Naruto, being so powerful and mysterious Murasaki once suggested it may have a mind of it's own.

It appears as an over-sized, sabre-like sword with a green handle and golden crossguard. The blade s also quote abnormal, being black on one side and silver on the other. It's kept in a blue, wooden sheath which is inscribed with various mystic symbols on the inside on Murasaki's right hip.

Abilities
Murasaki has laughingly named Yoridai's abilities as "scaring things". The blade is infused with a very macabre chakra, said to be of it's forger whom died while creating the blade. The chakra itself is so strong that only people of Murasaki's level are capable of touching the handle of the blade while overcoming the blade's abilities. This aura of chakra pushes away almost anything coming near the blade, even the air surrounding it. Anything the blade comes near to automatically moves itself away from it, hence Murasaki claiming it "scares" things. This is why Murasaki is almost unbeaten in terms of swordfighting, as nothing can come near him as long as he holds the blade. Sakaki was the first and only one to find a way around this, using his Sword Technique: Vermilion Bird to strike at the handle of the blade, which doesn't seem to possess these abilities.

Technically, Yoridai is incapable of hurting or cutting something, but Murasaki found a way around it. If the object he's aiming at has no way of escaping, it will eventually tear itself apart in an effort to escape the sword's touch. This was demonstrated in a very cruel way by Murasaki during an interrogation, where he moved Yoridai closer to the stomach of a chain-tied opponent, resulting in the skin, muscles and body fat ripping itself apart, away from the blade in an attempt to escape, obviously resulting in excruciating pain for the victim.

It seems that the only things capable of resisting Yoridai's influence is the sheath holding it and Murasaki himself, to some extent. The sheath was fabricated along with the blade, and the maker imprinted various mysterious symbols on the inside of the wood which enabled it to overcome the blade's powers. Even today, various intelligence organizations from around the world are researching replicas of these symbols, trying to find the system behind it to provide a valuable defense or offense. Murasaki is also capable of controlling the blade's influence to some point, by biting his thumb and inscribing a pattern upon the sheath of his blade, which forces it to retreat back into the sheath. He improvised this for when he should ever drop the blade, which would cause it to theoretically create an ever-continuing hole in the ground.