Hunter Soul

150 years ago the first tower rose, however nothing could hurt the monsters inside, after 3 months the tower evaporated and every monster inside including the boss was let loose, it took a nuke just to damage them. More towers rose and so humans studied them, finding gems inside of different quality, E, D, C, B, A, and S were the tiers given. Using these gems weapons were made that could easily kill the monsters, hiwever they then grew too and were given the same ranks as the gems now called mana crystals. Then humans started having a weird phenomena, Awakening. Sometimes a human would awaken which gave them an element of mana to cast a type of spell, be it traditional elements like fire or unique elements like gravity. A new job rose called the Hunter. Hunters enter towers and clear them before the 3 month point where they break. They also gained classes which gave a unique power, like rangers, healers, summoners, necromancers, etc. Each country created a hunter association to handle high end towers, whike smaller guilds could be made to have teams of hunters clearing towers. Hunters also adopted the same letter classifications as monsters and mana crystals.