The deepest part of the palace is a vast lava pool, filled with solidified magma, fiery chains, and blood-stained torture devices.
This was once the place where Piere imprisoned Zarriel, but now it's become Zarriel's chamber, with the Fallen Angel at its center.
Her eyes are tightly shut, wings folded, sitting on an iron throne forged from swords and demon bones, enveloped in Hellfire, exuding the terrifying pressure of Avernus.
Zarriel has projected most of her strength into the Material Plane, leaving her body in Avernus just to maintain the connection between the two realms.
At this moment, the confrontation between the will of Avernus and the Material Plane is extremely intense, reaching a white-hot stage. The entire Avernus shakes constantly, the ground cracks, volcanoes erupt, and many Inferior Devils perish in the disaster.