Dungeon and Hunters

Dungeons are portals that appears randomly out of nowhere and stays there until someone exterminate it. And if a dungeon is left alone, the monsters will come outside and cause havoc in the real world. Hunters are people with supernatural abilities who’s job is to exterminate dungeons before the monsters could come outside. In other words, they are superheroes in this world. Monsters give hunters magic energy for them to increase their magic energy pool. Treasure chests give hunters equipments for them to get stronger and have a higher chance to survive. Dungeon boss gives magic energy and equipments to hunters. Dungeon crystals give hunters dungeon pills for them to get stronger in other words dungeon pills are steroids.