Guru Gobind Singh's Kara

Origin
Guru Gobind Singh was the 10th Sikh Guru, along with a spiritual master, warrior, poet and philosopher. When his father, Guru Tegh Bahadur, was beheaded for refusing to convert to Islam, Guru Gobind Singh was coronated as the leader of the Sikhs at age nine, becoming the last of the living Sikh Gurus. Among his notable contributions to Sikhism include founding the Sikh warrior community called Khalsa and introducing the Five Ks, the five articles of faith that Khalsa Sikhs wear at all times.

An iron bracelet called the kara is worn as a constant reminder that any actions done must always be in accordance with Sikh teachings. It has also been repurposed for hand-to-hand combat, where soldiers would fight with spiked or sharp karas as knuckle-dusters.

Effects
Will constantly notify the wearer when they are successfully following their own rules or straying off course. It will gently rotate up and down the arm when following their predetermined code, and will tighten when sensing opposite sentiment. If failures continue to persist, the user will suddenly feel their fingers snap as their knuckles are clumsily crushed together.