In Wow where you need buy wow gold to enter, yogg saron is the final boss. If you want to beat it, you will require killing all previous bosses.
Flame leviathan must be killed to access the next part, consisting of: lgnis and Razorscale, both of which must be killed to access the scrap yard: which contains XT002 Deconstructor, which you must use wow gold to kill to access the inside of Ulduar.
In the antechamber, you must go off to the left wing and kill the lorn council to open the door to the rest of the instance. After that door opens you must have cheap wow gold to kill Kologam to actually cross the path into the rest of the instance.
From here, the raid is fairly non-linear. You have your choice between Auriya, Mimiron, Freya, Thorim, and Hodir. However, you must kill all of them to access the decent into madness.
Down into the decent, you encounter general Vezax, who is blocking the door where yogg-saron lies in his prison.
As far as the completely optional boss, Algalon the observer, who you can find in a wing to the right of the antechamber, you must kill all 4 hard modes of the watchers, Hodir, Thorim, Freya, midiron, to even open the door to his room and do what you need to do.
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