Blood Oath

You choose up to six targets. Each one swears an oath written in blood, to carry out or refrain from some course of action or activity. This oath must be taken willingly, free of any magical coercion or enchantment. While a creature is under the effects of this oath, if it acts in a manner directly counting the effects of the oath it suffers a level of exhaustion that remains until the oath is completed. This effect can trigger no more than once per day. The effect ends when the oath is completed.

You can also choose a different target, which can be yourself or any other target, to act as keeper of the oaths. The keeper may release the enchantment by using an action to dismiss it. The keeper can also use an action to remove any levels of exhaustion incurred by violating the oath.

A remove curse or greater restoration spell can also end the enchantment, but the caster must also make a Wisdom saving throw. On a failure, the Enchanted creature dies and the oath is transferred to the caster. A wish can end the oath normally.