Hiden: Discerning Eye Technique

This kinjutsu, invented by Kumogakure alongside the weapon Kaojashin, seals the user's left eye in exchange for granting them an extraordinary sensing ability: the ability to target an opponent much like the scope of a high-powered, including the ability to detect an opponent's chakra signature. Additionally, the seal can identify the user's elemental affinity, allowing Kaojashin to absorb their elemental chakra and create.

Trivia

 * refers specifically to bullets fired by a rifle.