The scientific name for the monsters is Adverna, which means aliens/monsters. Boss monster's scientific name is Dominus, which means boss monster, lord, or king of a race of adverna.
- Aneicyon Dirus: These are the direwolf-like monsters we met in the prologue. They are larger than the standard 5-seater car, glowing red eyes, fangs similar to tusks that drip endless drool that contains neurotoxins, sharp spikes along their spines that retract and fully extend like personal body armor, and fur and tails(2-5 depending on their level) that sharpen and shoot out tiny needles.
- Unicornis Lepus: These are what Nathan calls Unniebits (bunnie bitches), but the rest of the Hunters just call them Jackalopes. They are a carnivorous rabbit the size of a bulldog. They have a unicorn horn, with steel-like fur that shoots out like a porcupine. They have a habit of going for the ankles of Hunters.
- Serpens Caprae: a monster goat the size of a horse, with a split-snake tongue and a tail of three active & independently moving snakes, breaths out poisonous flames from its goats-head mouth. Its hair shifts between black, grey, and white to blend in with the mountain terrain.
- Hydra Arbor Androphagi: A man-eating forest that splits and multiples no matter how many times it's cut. A connected entity that can operate individually on instinct or act like a swarm controlled by a bee queen (the tree dungeon boss: Yew). A parasitic creature that can move unrestricted and send out its roots and branches like tendrils.
- Serpens Mons Draconis (Basilisk): A snake so large, its body can wrap around the base of a mountain numerous times. Has dragon wings but for gliding (not flying)