The demons return to their caves.

Midden and his brethren cart their mortal trophies through the winding halls of the hotel complex.

This whole resort has been built from the ground up by the demons to lure the humans in and take their souls. Behind the walls lie secret passageways, tunnels that allow the hell-kin to travel from their caves deep below the earth up to the world above.
Now, with their hunt complete, the devils return to their home.

Midden steps into the line, a single-file row of his brothers making their way through the tunnels downwards. The caves are cramped up here, but they widen up as they get deeper. Gas lamps line the walls, lighting the way.
Soon they come to a fork in the road. Some of them, The ones who where unable to catch anyone in the hunt, take the right tunnel. They all grumble under their breath, next time they'll get one next time, etc, etc...
Midden, always a friendly sort, gives them a kind word and a warm gesture. He finds that allies are better than enemies. If he ever needs their help, maybe they'll remember him fondly. At least, that's the idea.
The others, the ones who scored their prey, take the left fork. The one that leads downward. To the ritual room.

The tunnel gives way to a massive cavern, a great plateau overlooking a lake of green mist. Midden can never resist glancing down into the depths. This mist was the Hel; the great mystic energy that all demons were born from. Only the leader of the clan, King Calamity, knew how to weave the Hel into the shapes of Midden and his brothers.
At the top of the plateau is the ritual center.
There are a pair of chains hanging from the roof of the cave. These were said to have bound the wrists of the Great Traitor Royvis, centuries ago. They are meant to bind the mortal captive in place so that the ritual can go un-interrupted.
There is a mechanical claw, bolted into the floor. It's attached to a robotic arm that can be controlled by remote. This claw is a creation of the King, a marriage of magic and technology that can pull the very soul from a humans chest.
And lastly, there is The Vat. A great metal pot containing all of the souls that demon-kind has collected since their campaign began. It is only a third full now. That will soon change.

Midden waits nervously as the head of the line straps his captive into the chains. This is the most glorious moment of his life. The moment where he will overcome the damned sun. The Evolution that all devils crave.