He was working as an adventurer in the oracle city.After days of hard work and grind his rank finally went up and he got promoted as a B-rank adventurer.There were 5 ranks according to the adventure guild A,B,C,D,E. The D and E rank jobs consisted mostly of exploring and collecting different items like herbs and other valuable collectibles.The C rank jobs consisted of fighting low-level demons and goblins.The A and B jobs consisted of all the jobs including the other ranks and they were allowed to explore dungeons and fight stronger enemies
He was really happy that he finally got a promotion, because fighting stronger enemies and exploring new dungeons will be valuable for him in many ways like leveling up quickly and getting new weapons and power buffs.His first mission was to explore a small dungeon that was located on the south side of the city.After buying the necessary equipment and potions, he was set for a new journey
After some hours of traveling on my horse,he finally reached the entrance of the dungeon.He checked the map,to see if he was in front of the correct dungeon.He started making my way inside my dungeon by pulling my sword and shield out, killing poisonous spiders and some maze goblins.They were irritating and huge in number,but he was an experienced person in sword mastery so it wasn't that difficult for me.He was worried for a moment because he thought the dungeon feels too easy,there might be a serious trap ahead,so he kept his guard up all the time
Some minutes passed,he entered the door which was leading to the core of the dungeon.If someone destroyed the core,the whole area will go into permanent sleep and any monsters present will die automatically, because the core provided energy to the monsters and generated magic which kept the area active.But he didn't realise he would see something that will make him so shocked (edited)