WoW Ulduar WotLK Classic: how to unlock Algalon the Observer?

World of Warcraft: Wrath of the Lich King Classic Phase will be available soon, bringing a new raid to WoW:  Ulduar's  WotLK This raid is one of the best known and favorite raids for players.


In this raid, you will encounter a total of 14 bosses and the final battle with Yogg-Saron as well as Algalon the Observer. In this guide, we’ll show you how to face this boss!


No longer being able to access the room in which Algalon the Observer is located, nothing could be simpler! To invoke it you will have to perform 4 steps:


- Defeat the Assembly of Iron on Hard Mode then get the Archivum Data Disc  item .


WoW, Ulduar WotLK Classic, How To Unlock, Algalon The Observer

- Then accept the quest that sends you to the Archivum, behind the Iron Assembly.


- Once there, Prospector Doren will give you the quest The Celestial Planetarium. Accept it, then collect the Sigil of each Ulduar keepers.  You will have to defeat Freya, Thorim, Hodir and Mimiron on Hard mode.


- Once the Sigils have been collected, you will then receive the quest from Algalon the Observer.  Now go back to the Archivum  and get the  Celestial Planetarium Key  to fight him.