I have three types of supernatural beings in my world- Abyssoul/LASA. Each of them lines up with the encompassing spheres of the realms.
And as they line up with one realm and depending on strength of the individual. They may be able to access the other realms.
-Spirits, beings of the physical realm.
Spirits are aspects of nature manifested into physical forms elements like; plants, decay, seasons, light, valleys, ect. Some spirits will have two forms, a more physical form and an ethereal form. This is where both Sorcerers and Dragons fit into; Sorcerers are spirits whose physical form is that of a human, while Dragons are spirits whose physical form is that of geographic traits and phenomenons. It is not uncommon for spirits to be found in councils led be a grand spirit.
-Monsters, beings of the dream realm.
Monsters are born of humanities imaginations, fears, and desires, they naturally plunge into pits found within the dream realm. As they build up over time, a monster is born. Some monsters find their way alone in life just fine. While others, upon their birth have an intense urge. To find themselves another half, a human. Once the human in the dream realm is found, a bond is made between the two. Creating Monster-folk. Unlike a "Wild" Monster, Monster-folk are incredibly sociable and seek out the company of others. weather it be monsters from the same pit, others who fit with their monstrous origins, or weather it's just a rag tag group of misfits.
Monsters have been able to enter the physical realm on occasion, using either an ancient well of souls or by a spell caster who was not cautious enough in calling the powers of infinity.
-Abominations, beings of the realm of infinity.
Some might say that they are universally the strongest, but that's because only those strongest and their lesser spawn they can summon can be made manifest in the physical realm. Some scholars have argued that Wisps are Abominations, while just as many will argue that they are Spirits. They're origin is unknown, as it is fully possible they have always existed, and will continue to exist.