Start off by attacking Baraguj Szuul. When you do this, you will be teleported into his stomach. Mobs will come in waves until you reach the Unimaginable Horror. Kill the horror and you will be teleported back outside where you can attack and kill Baraguj. Killing him gets you a container called the "Mouths of Baraguj Szuul."
Into the container, you need to put the following, which all drop in this Plane:
Orb of Anguish
Orb of Agony
Orb of Pain
Orb of Suffering
Combining them gets you the key to Saryrn's chamber
Everytime I tried doing that event the zone crashed on me after I got ported inside its stomach so I can't do the combine for Chamber