The overall concept of the “underworld” for Estorest. It is the home of demons, daemons, and devils that all live there. Not much is known about this world besides this is where the demons from the demon war came from. It is difficult but not impossible for residents of this world to make it to the mortal plane. The Remnant Seal blocks a mass amount of underworld citizens from rushing into the mortal planes. A handful of creatures, either with bargaining, sacrifice, or a helping hand from the other side, can make it through. Creatures sent back to the Dark are often unhappy with it because of the great effort it takes to make it through the Seal.
The Wastes are split amongst three main types that all share the Wastes but have their own carved out sections: Devils, Yugoloths (also known as Daemons), and Demons.