Oath of Binding

Bind a willing creature or a creature that fails a CHA save to a specific oath no longer than one sentence. If the target knowingly violates the oath, it takes 55 (10d10) psychic damage and the violation is marked visibly until the oath is fulfilled or dispelled.

This power has its own stable page so it can be linked from any character, item, location, story post, bargain, curse, or future reward.