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Comment by 358178

Once you get this part of the quest chain you walk back out toward the stairs that would lead up to Kalogarn and go to the opposite side of the Iron Council's hall. Once you explore it go back to the NPC that gave you this quest and he'll give you the 4 quest, which require you to complete the bosses on hard mode. I'm assuming after this you'll get a quest for hard mode Yogg'Saron up to Algalon.

Comment by Maliander

Quest chain:

Archivum Data Disc - Started from Archivum Data Disc - Dropped by killing Molgeim or Steelbreaker last in the Iron Council ecounter.
The Celestial Planetarium
Hodir's Sigil - Defeat Hodir on his hard mode
Thorim's Sigil - Defeat Thorim on his hard mode
Freya's Sigil - Defeat Freya on her hard mode
Mimiron's Sigil - Defeat Mimiron on his hard mode
Algalon - Recieve the Celestial Planetarium Key which allows the entire raid acces to Algalon once Yogg-Saron has been killed.
Kill Algalon to be able to get All is well that ends well.

Comment by Tyrsenus

Unlocking the Celestial Planetarium

Complete I Choose You, Steelbreaker or I Choose You, Runemaster Molgeim, enabling one Archivum Data Disc to drop (it is not party loot; similar to Key to the Focusing Iris).
Accept the quest from the disc and bring it to the Archivum Console, located beyond the Assembly of Iron.
After listening to the Archivum Console speak, accept the quest The Celestial Planetarium from Prospector Loren. Locate the Celestial Planetarium and return to Prospector Loren.
This enables four quests to obtain the watchers' sigils, which may be performed in any order:

Freya's Sigil - Complete Knock, Knock, Knock on Wood.
Hodir's Sigil - Complete I Could Say That This Cache Was Rare.
Mimiron's Sigil - Complete Firefighter.
Thorim's Sigil - Complete Lose Your Illusion.

Complete all four quests to enable the quest Algalon from Prospector Loren.
Simply speak to the Archivum Console to complete the quest, rewarding Celestial Planetarium Key.

Comment by grewe02

Once you obtain the discs and begin this quest, Make sure you return to Prospector Loren before you continue killing bosses, otherwise you will have to wait till next week to turn in this quest and continue the chain.

Comment by rblackburn1985

If you are having issues getting the next quests or getting your sigils to drop, make sure you are on the correct quest for the instance, 25m or 10m. I couldn't figure out what was going on until I realized I had a second disk and started the quests on 10m.

And then ta da!

Comment by MoarHeroisms

I had this quest in my log for ages, so when I went to finally turn it in, Prospector Doren was not there. Apparently he disappeared when 10-man and 25-man modes were merged, making the sigil questline impossible to complete.

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The Celestial Planetarium

Prospector Doren at the Archivum in Ulduar wants you to locate the entrance to the Celestial Planetarium.

	Entrance to Celestial Planetarium located (1)

Description

Listen, <lad/lass>! Azeroth's fate is at stake here.

Our only chance is to get to the Celestial Planetarium in time to find this Algalon and stop him from beaming back any messages to his Titan masters.

Locate the Celestial Planetarium and come back with any information you get. We might still have some time to prepare for Algalon's arrival.

Completion

Rewards

You will receive:

Gains

Upon completion of this quest you will gain:

See if you've already completed this by typing:

/run print(C_QuestLog.IsQuestFlaggedCompleted(13607))

The Celestial Planetarium

Description

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