In order to start the quest you must be able to speak Thulian.
You must be Level 60 to get this quest.
Starting the Quest
This quest starts by speaking to Sinephobis at the very back of the temples on the Fear Tainted Isle in Tenebrous Tangle (take the cloud transport station found at the upper West side of the Temple Grounds island in Tenebrous Tangle - on the way to the Sanctum of the Scaleborn). When speaking to him, be subservient and give proper respect to the Priest of Fear. Do not try to bribe him.
To save time, pick up a (1) scintillating incense prior to starting the quest.
Harvest five dragon bone parts in The Bonemire which can only be seen if you are on this step of the quest. They spawn somewhere in the area of these locations and have a short (1-3 minute) respawn timer. A Gnomish Divining Rod can be used to save time in finding the nodes for this step (a pile of dragon bones). You can also use the tracker for harvestable items if you are over 90 in tradeskill and got it from tradeskill prestige AA.
Return to Sinephobis and he will give you a recipe. He asks you to gather a few uncommon T7 harvests from any T7 zone (including Loping Plains). You can harvest them or buy them off the broker. If you already have the items, you can place them in a harvest depot or sales display and remove them for the update. You can also have someone give you the items or have them traded back to you. The items you need are:
blue-silver sheet from ore nodes (Kingdom of Sky zones: "firmament stone;" Loping Plains: "protruding vein")
perfect osseous lumber from wood nodes (Kingdom of Sky zones: "twisted wood" - found in Tenebrous Breeding Grounds; Loping Plains: "slate lumber")
You can use the Commission System for this step. If you use the Commission System for this be sure the person you are commissioning for uses their Instructions otherwise it will take your instructions.
Do'ellin the Young is a (quite underconned) 67^^^ dragon with an AOE knockback who spawns up on the rock in the middle of the pool at the bottom of the waterfall ( 686, -166, 261 ) Copy/waypoint 686, -166, 261 on the Isle of the Ravasect in The Bonemire.
Start the fight from the waterfall side and/or in the pool, lest his knockback throw you right off the island.
When Do'ellin gets down to about 10% health, he will break the encounter and appear as an NPC, Do'ellin with '<Subdued>' under his name. High-levels should mentor to 65, lest Do'ellin gets stuck at 1%.
You will need to find "a spot on the isle, away from any mobs, to use the rod". Near the cloud station on each isle works nicely, though the Fear-Tainted Isle rod can also be placed right next to Sinephobis.
Suggested order: place a rod by Sinephobis, then go to the Fear-Tainted Isle cloud station and take the cloud to Gazer Isle. Place a rod by the station there, then cloud to Bixie Isle via Ravasect Incursion Point. Place the last rod by the Bixie Isle station and you're done.
In the past there appears to've been an issue with placing the rods. If this arises try the Discussion Page Placing the Rods for further suggestions.
This will start a ring event animation: Spirit of Do'ellin vs multiple a priest of fear. After Do'ellin kills all the priests you get to kill him for the update. Do not attack Do'ellin before the event has finished -- if you kill him prematurely you will have to wait 30 minutes for respawn.
The ghost dragon is considered a massive undercon with a nasty AOE knockback. Get yourself positioned into a corner, where the temple stones and the mountain wall meet together just behind the dragon.