A thousand meters underground from the South Heaven Gate Fortress.
Here lies a massive cavern hollowed out by an unknown entity.
Under the blood light, a horrific scene unfolds.
The dark red pool of blood shimmers with a faint glow under the dim blue light of the cave, like an endless Hell of the Sea of Blood, permeated with a heavy scent of iron rust.
Countless tiny streams of blood meander from all directions, converging into this vast Blood Pool, where each drop of blood forms into alarming little blood beads, gently quivering and dripping below, becoming part of the Blood River.
An intricately crafted coffin lies quietly beneath the Blood River, its surface reflecting blood red light.
The coffin's surface is smooth and cold, carved with intricate patterns that, under the blood light, appear eerie and mysterious, emblazoned with the demon patterns of summoning Cain.
Cain, known as the bloodthirsty Demon God, the immortal King.
