The Mauk-to'Vor was a Klingon ritual that allowed a Klingon to kill a wrongfully disgraced sibling to restore their honor in the afterlife and ensure their entry into Sto-vo-kor. The ritual required adanji incense and was carried out when one sibling plunged a mevak dagger into the other's chest.
This ritual was the equivalent of ritual assisted suicide and was banned by both the Federation and the Klingon Empire unless a warrior was injured and could not receive medical attention or they were a burden on their house. Those who practiced this by themselves or Hegh'bat without having their honor restored would be dishonored and sentenced to Gre'thor.
Kurn requested that Worf perform the Mauk-to'Vor in 2372, though the ritual was interrupted by Odo and Jadzia Dax and Kurn was revived by Julian Bashir. Though initially angered by the interruption, Worf later came to agree with Benjamin Sisko that the ritual was no different than committing murder and decided not to carry it out. (DS9: "Sons of Mogh")