In Shard of Fear ( -1835, -28, 455 ) Copy/waypoint -1834.66, -27.85, 455.24 in The Feerrott. Speak to an Essence of Fear at the very back of the dungeon in front of the fire wall around the temple ( -8, -2, -300 ) Copy/waypoint -8, -2, -300. If you can not enter you may need to Mentor to Level 70 - 75. Note: Click on the building/structure to enter, not the glowing part.
Go to the Ruins in Fens of Nathsar; the temple is an underground door at ( -93, 31, -1047 ) Copy/waypoint -93, 31, -1047, near the Cabilis sokokar post.