The Shihai-Gamen clan specialized in chakra manipulation, demand high expectation of its members to have extreme well chakra control and capacity, endurance, patience, and discipline. The Shihai-Gamen means To endure control or Control to endure. They specialized in purely chakra manipulation. It was started way back in beginning of Shinobi War, there was a unexpected leak or explosure of demonic chakra (nobody know what demon it is, where it from, or how it appeared for that matter) in a small village, killing most of its population, leaving a very few survivors with surprising left demonic chakra in them, only two of them is the founder of the Shihai-Gamen clan, while other was killed by people who feared/viewed them as demons/non-humans/freaks or from an experiments. Those two surviving