To complete the Embarrass Haelga miscellaneous quest, the Mark of Dibella must be obtained from Indaryn. Find him at the Black-Briar Meadery in the daytime (he is usually in the lower level), ask him about the Mark, then (Persuade) him to hand the Mark over. This is the easiest Mark to obtain.
It's also possible to pickpocket him in order to obtain the mark as well.
If the Dragonborn kills Indaryn before completing Mark of Dibella, the quest will fail automatically.
Indaryn can be killed very easily in the Bee and Barb during evening, when the inn is filled with people. By dropping a food item (e.g., cabbage, sweetroll) on the ground, Asgeir Snow-Shod and his father will attempt to grab it but is interrupted by Indaryn. This results in a swordfight between the three, usually resulting in Indaryn being slaughtered because the Snow-Shods are essential for most of the game.