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The Underdark comes alive during the eighth chapter, where you must stop Cireka from opening the portal. You'll be facing hordes of Githyanki during this level, but the way is made a little easier with Zhai at your side. Due to the many shadows down here in the depths, the Drow Rogue is extremely lethal, so use her to make instant kills whenever possible. After taking out the first wave of Githyanki, you'll enter a large chamber where you'll once again be set upon by Githyanki warriors. To advance to the next room, you must destroy the ice barrier being manifested by the Githyanki wizards atop the platforms.

The barrier isn't very difficult to destroy, but taking out the wizards can prove to be a nuisance. After a few ranged attacks at them, you'll most likely be struck down by one of the Githyanki warriors pouring into the room. Rotate between the two until all four wizards are dead, then concentrate on the barrier in front of the large wooden door. More wizards may appear on the platforms later on, so take them out once again if they do. When the barrier finally falls, you're free to move into the next room.

Pass through the room filled with candles and into the next hallway where a chest awaits your plundering ways. A few more Githyanki warriors block your way to the portal, so take them out as quickly as you can. When you reach the portal, Cireka is not happy to see you. She calls in another wave of Githyanki warriors and wizards and then jumps atop the portal. THe wizards keep her guarded with magic, so you need to kill all four of them before you can inflict any damage on her. Use Illius to take them out from a distance, then continue using ranged attacks to bring Cireka down in health as quickly as possible. When she reaches a certain level, she will jump down from the portal and Goro the Slaad Lord will appear. While these two do battle, Illius will begin using the Demon Stone in an attempt to trap them once again.

While Illius concentrates on imprisoning the two, you must use Rannek and Zhai to keep the constant flow of Githyani, Slaad, and other demons at bay. When the imprisoning is about to conclude, a cutscene will show Goro blast Cireka through the portal and then follow her into it. Since the imprisonment was unsuccessful, our band of adventurers chases them into it. But where does it lead?