Although this passage can only accommodate demons of the First-Ring Level, it's already sufficient to deal with this minor plane.
They only need to occupy this minor plane to open the Gate of Hell, allowing more powerful demons to enter here.
Then they can use it as a springboard to enter the Wizard World.
They have many such plans; Hell is the ultimate destination for all creatures in the world!
"These foolish humans think our seal will never be broken, but we're just waiting for the passage to become large enough for us to pass through."
"Indeed," another demon said coldly. "This time we will bring even stronger power."
"This Wizard World's subsidiary plane will become our springboard into the Wizard World."
"We want to nourish this world with their blood, let Hell descend!"
The third demon's face twisted, its eyes burning with hatred and venom, "Let the whole world tremble under our cold, unfeeling rule!"
