When you reach the end of your quest, roll the challenge dice and compare to your progress.
On a strong hit, your vow is fulfilled. Mark a reward on your quests legacy track per the vow's rank: troublesome=1 tick; dangerous=2 ticks; formidable=1 box; extreme=2 boxes; epic=3 boxes. Any allies who shared this vow also mark the reward.
On a weak hit, as above, but there is more to be done or you realize the truth of your quest. If you Swear an Iron Vow to set things right, take your full legacy reward. Otherwise, make the reward one rank lower.
On a miss, your vow is undone through an unexpected complication or realization. Envision what happens and choose one.
- Give up on the quest: Forsake Your Vow.
- Recommit to the quest: Roll both challenge dice, take the lowest value, and clear that number of progress boxes. Then, raise the vow's rank by one (if not already epic).