A Throne Fit For A King.

His abyssal plane is split into ring-like domains based on the concentration of sin energy. The external ring at the very edge of the plane is the domain of fledglings. A black vine-like plant occupies the areas at the edge of the plane without streams of lava. The streams of lava flow over the edge like a waterfall into somewhere below while the black vine reached up to the edge of the plane from somewhere below. 

The black vine is called the demon sire. It is responsible for the production of newborn demon fledglings in all planes of the abyss. The demon sire is said to be an extension of the tree of sin that is situated on the 1st plane of the abyss. The tree of sin reaches down into the abyssal planes like the energy pillar reaches down from the energy sea.

The demon sire is a very prolific plant. It produces large succulent-looking fruits. These fruits are definitely not edible. It is because they are not made for eating. They contain gestating demons.