Sanctity of the Dead

Sanctity of the Dead is a side quest in the Fallout: New Vegas add-on, Honest Hearts.

This optional quest is received simultaneously with Flight from Zion along with Prisoners of War and Retake the Bridge.

Detailed walkthrough

 * Travel to the burial mounds and kill all of the White Legs.
 * (Optional): Speak to Dancing Flame at the northernmost map marker (the one closest to the riverside). The Courier has several options when speaking to him.
 * Tell him and his Dead Horses back up to stay put so that they don't get killed, while the player character goes to "smash White Legs alone". He will be a little upset, but will say that since the Courier is a friend to the Sorrows he will stay put, but that you had better kill the White Legs.
 * With a 75 Speech check, you can convince him to leave by saying that he's no match for the hardened White Legs warriors. He and his companion will depart, saying that "angry ghosts" will have to be enough for the Sorrows. This will end the quest, but the White Legs remain at the burial ground so you will still need to avoid confrontation or kill them.
 * You can say "sure, whatever", and let the two Sorrows tribals fight with you. This will make the fight easier, as the two warriors will keep one or two of the White Legs preoccupied. Dancing Flame and his companion will survive the fight if you're quick about taking the White Legs out. With Joshua Graham in the party, this should not be a problem. If Dancing Flame or his companions die, the quest is failed.
 * You can also tell them to wait and not do anything "crazy". Dancing Flame will then wait, but not forever. If you then proceed to wipe out the White Legs, Dancing Flame and his companion will have left. This ends the quest.