The challenge letter for a Life and Death Duel requires not only the fingerprints of two Inner Sect elders as witnesses but also the fingerprints of both parties involved in the duel.
Once one party issues a challenge for a Life and Death Duel, if the other party accepts, it becomes a fight to the death!
However, if the challenge is declined, that's allowed too.
But at that point, the challenger has the legitimate right to discipline the other party.
As long as they don't kill or cripple the other party, they are free to act as they please.
The above describes the rules of the Life and Death Duel challenge.
For a regular duel challenge, once it is issued, if the other party has ever left their quarters and seen the challenge letter, they must accept it.
If refused, the one who issued the challenge gains the right to force their way into the quarters and engage their opponent in a duel.
The duel challenge system is a distinctive feature of the Moon Radiance Sect.