Dungeon world

in this world, everyone lives underground due to the new ice age, making it unhabitable to live on the surface. There is a lot of tunnels that connect to underground kingdoms. Every underground kingdom has dungeon systems and leveling systems. It's like a real-life video game. A god that goes by the name Zila, created the leveling systems. A future holographic screen will appear above you and help you and it will also show you your level and rank. The ranks are E-Rank: The lowest rank, typically assigned to hunters with minimal abilities. They are often seen as disposable and have limited combat capabilities. D-Rank: Slightly stronger than E-Rank hunters, but still considered weak. They can handle low-level dungeons but are not highly valued. C-Rank: Competent hunters who can take on moderate challenges. They have a better chance of surviving in more dangerous dungeons compared to lower ranks. B-Rank: Strong hunters capable of tackling high-level dungeons. They are respected and can earn a decent income from their work. A-Rank: Very powerful hunters who can take on significant threats. A-Rank hunters are rare and highly sought after due to their abilities. S-Rank: The highest rank, representing the most powerful hunters. S-Rank hunters possess immense mana levels that cannot be measured by standard technology. They are extremely rare and often have significant influence and wealth. Within this category, there are also National Level Hunters, who are even more powerful than typical S-Rank hunters and have authority comparable to that of a nation. To become a leveler, you will need to get a permit at the level HQ. Then you can start your dungeon journey. Every dungeon boss does not die, they will always get revived every time they die. When the leveler completes a dungeon, they will get teleported instantly back to the leveler HQ. (I also took inspiration from solo leveling :)