Get the tome, give to hinian for quest dialong. loot the 8 no drop body parts and get the container (coffin) in the torture chamber.
When you combine the coffin you spawn Orunis. He cons indiff. Beware he despawns after about 2 mins regardless if you talked to him (have to start over with the 8 drops again now).
I assume you get the amulet from him and give to hinian to spawn the raid fight and get phat lewts.
I just found out how to do the quest, and submitted, but for those wanting to solve it now and not wait till its posted, spawn Orunis, tell him 'what ancient artifact' and then tell him to 'release' and you get Moon of Orunis. Turn in Moon of Orunis to Hinian, and he turns into a werewolf. BE PREPARED, he hits for 2500 and very fast. Also since the zone in is buggy pathing, he warps around. We had 1 group and wiped without warning, and I didnt get a chance to tell how much HP he had. Shortly after wiping, he despawned. He had no AEs that I seen either.
There are already two raid events in the zone. It would have been nice if they would have made this a solo or group event instead of requiring a raid once again.. since after all, only one person can collect all of the parts to combine in the coffin.
Going to be tough getting a raid to do this. By the sound of it, much of the loot is nearly identical to what Heyda Fadesong and Tyrian the Tormented drop also. I don't see why anyone would go to all of the hassle of collecting these parts when they can collect the one part needed to spawn each of the other raid mobs. 25 hours spent in this zone as of now, and still only 6 out of 8 of the coffin drops seen.
I think it has a lot to do with what part of the zone you are hunting in. I've managed to collect 2.5 sets of the objects and I haven't near the time you have in the zone. The heart and the tongue seem to drop more often in the castle than they do the rest of the zone from my experience.
I only had trouble getting the heart, I had seen every piece except for the heart on the first day. Heyda isnt really a raid mob in my eyes, seeing how I've one grouped her 4 times now. I'm sure I could do this fight with 1 group too, just was unprepared =)
Hand the dusty tome into Hinian, and he will give you a little exp and offer a quest dialogue, which in short explains that he has heard of this Oranis but does not know the location of him or the artifact he carries. He asks that if you happen to find this artifact, bring it to him, and you will be greatly rewarded.
Just a hunch, but I think you may need to hand in the dusty tome before you do the coffin combine as part of the quest progression. If anyone has a chance to try this, post here. I'm still missing the dried out tongue to complete my combine and attempt this.