Oath Magic

Oath magic (誓いマジック, Chikai majikku) is a caster type magic that is based on oaths" or "magic vows"  that make the user who made the oath incapable of breaking the oath unless the circumstances are dire. 

Description
''"Oath magic holds anyone to the oath they made with that magic. They are physically incapable of breaking the oath. For example, if someone made an oath with oath magic to keep a secret, they would not be able to tell said secret. Their magic would not allow them to speak, most likely by blocking signals sent to the voal cords by the brain, therefore rendering them unable to speak until they decide aganst telling the secret."

- the creator of oath magic explaining how it works. If a user makes an oath with this magic, the user cannot go aganst the oath, their magic will stop them, even going as far as to knock them out to stop them from breaking it.There are different types of oath magic, The blood oath, the dark oath, the emotional oath, and the sensual oath. The blood oath is made by the user cutting their palm, channeling magic into the blood coming out of their palm, and makeing the vow. a magic circle then appears and absorbs all the blood, and the user is incapable of breaking the vow, the price of attempting to break a blood oath is becoming incabable of using any limb that they could use to break the vow (other than vital organs). The dark oath is made by a user placing a magic circle on their shadow and making a vow, the shadow is the absorbed by the magic circle, making it black, then the magic circle dissapears and the vow is made.The price for breaking a dark oath is immense pain that seems to be coming from inside the user. The pain grows until the user decides aganst breaking the vow. The emotional oath is made by the user making a vow, a spectrum magic circle appears and the users become extremely emotional until the circle dissapears. If a user tries to break an emotional oath, the emotion most likely to keep them from breaking the oath flares up in them, usually keeping them from breaking the vow. To make a sensual oath, you just make an oath and a grey magic circle will appear. In the circle will be a hand, a mouth, a nose, a ear, and a eye, representing the sences. If the user breaks a sensoury oath, they will either losse all their senses, or feel every sence at an unbearable level until they decide aganst it.''