If the Immortal Realm is the ultimate destination for all beings to ascend to and complete their life evolution, then the Underworld is the final resting place of all beings from the Ten Thousand Realms.
Regardless of your profound cultivation, all-powerful stature, or even if you control a planet, a world, the eventual outcome is death and dissolution, obediently falling in line in the Underworld.
Some, proud of their previous position as rulers of their world, disdain queuing, unwilling to accept treatment identical to that of mere mortals.
"I come from the Luo Floating World, I'm a great cultivator at the pinnacle of the Body Integration Realm, decisive and ruthless, having slaughtered countless beings in my lifetime. How could I be met with such treatment after death?"
The great cultivator from the Luo Floating World, uproarious with indignation, flew into the mid-air, grabbing one of the Underworld Ghost Officials.