Monsters: A general term for large creatures that have undergone unique evolution. They include Flying Wyverns, Brute Wyverns, Fanged Beasts, Leviathans, Temnocerans, and Elder Dragons. Oltura is classified as an Elder Dragon.

Forbidden Grounds: A general term for locations where entry is strictly regulated. In many cases, these areas house dangerous monsters like Oltura.

Hunters: Those who make a living by hunting monsters. They belong to the Guild and accept requests, generally prioritizing the balance of nature. However, there are also unauthorized hunters.

Riders: Those who live alongside monsters. They connect with monsters using objects called Kinship Stones, allowing them to ride and fight together. They are not well known to Hunters.