Legion's Highmountain Mini List shows three quests available only to Discipline Priest as available for all classes:

-The Burning Birds (Quest ID: 45564)
-The Feltotem Menace (Quest ID: 45587)
-Village of Corruptors (Quest ID: 45575)

These three quests appear on my Druid Mini List for reference.

The quests are part of the QuestLine for upgrading the Priest's artifact weapon and become available after completing the following quest: Discipline: Rumblings Near Feltotem (Quest ID: 47020)

It would be amazing if they could be marked as available to Priests only and removed from all other classes' Mini Lists.