A good way to earn reputation with the Ascended, the Wild Hunt, the Undying Army or the Court of Harvesters is to complete daily quests.
The daily quests are given by Ta’lan the Antiquary and Finder Ta’sul. Both are members of the Cartel Ba. These are commonly known to us as Ethereals.
Their daily quests send us to a random dungeon. Complete the objectives to choose your reward: 350 Reputation with the faction of your choice.
These quest givers are located in The Broken’s Den. This is a room hidden beneath the Oribos The Idyllia Inn. The stairs are located on the left and right side inner-rooms of the Inn.