Hello Ownedcore
I found a way to get to Yogg saron without defeating all bosses.
Step 1: Clear the three main bosses
Step 2: Go to the Vezax door and Shadowstep through the door
Step 3: Kill Vezax then u are able to kill yogg saron
Video as an example:
https://www.youtube.com/watch?v=8RnF...ature=youtu.be
This exploit allows you to clear Ulduar much faster