Fantasy RPG

Hunters have a title corresponding to their rank and strength.
Examples:
Park Jeongin, the leader of a popular guild with the title of "great fire mage", has an A-rank, a fire mage can control and use fire for his own purposes.
Kogonhi, the chairman of one of the largest guilds, holds an S-rank, but due to his age, he retired from their hunters and no longer goes into portals.
Mages: has one element.
Necromancer: These are summoners, hunters can summon shadow warriors, the strength of the warriors depends on the hunter's mana, the number of warriors depends on the hunter's mana and intelligence.
Assassin: Hunters often possess special abilities, most notably those that allow them to become invisible to their opponents, increasing their speed and endurance. Assassins gain telekinesis, allowing them to attract objects of any size and at any temperature.

Hunters are people who have gained abilities through ranks. Only hunters can enter portals and defeat monsters. There are five hunter ranks.
Weakest: Rank E. Rank E Hunters often use weapons to carry.
Average: C and D rank. C ranks are usually healers, they have more mana than E ranks. D ranks are stronger than C ranks, they have more mana and access to magic equipment.
Perfect: A rank is stronger than C and D combined.
Strongest: S-rank. S-rank is the strongest, held by only 10 hunters in our country. Half-monsters can also reach S-rank.
Half-monsters are hunters, usually S-rank, and are people who can use the power of monsters by deforming their body or mana.
The rank of hunters is determined by the revaluation guild, which contains preparations that determine the rank of a hunter based on mana.
There are two major guilds in our country: Akadei, the most important and largest guild, accepts only D-rank hunters and above. This guild also has all 10 S-rank hunters. Oko-hito, the second-largest guild, assembles groups of D-rank and A-rank hunters for large portal expeditions.
Magical artifacts, as well as magical equipment, can only be used by hunters.
Magic equipment: equipment created by our ancestors, which cannot be made by humans. This equipment carries mana, which can enhance the hunter's mana and also works as a shield, but any equipment can break or the mana can run out.
Artifacts: They also contain mana, hunters can send their mana into an artifact, making their power stronger, such artifacts are usually a sheringan, a sword, a bow, a blade, a staff.
There are also special artifacts, these are artifacts created by the hunters themselves from their mana, they can summon and hand over their artifact at any time, but also, if the mana runs out, the artifact will disappear.
If a hunter's mana is depleted to zero, the hunter may die or be permanently deprived of his power.
Healers: Mostly D and A rank, they can heal any wounds and are dependent on their mana

Portals began appearing all over the world. These portals led to mine-caves where monsters lived, and if the portal wasn't closed, the monsters would spill out into the streets, posing a danger to ordinary people. A portal could only be closed by defeating the cave's boss. There were three types of caves:
Blue: For E and C rank hunters.
Orange: for class D and A hunters.
Red: for class A and S hunters.
The higher the rank of the portal, the more monsters there are and the stronger the boss.