Rigel slid down to the crater and checked the entrance that seemed to be buried on purpose. He could see the entrance had a frame made of stone around it, but the frame had been crushed by the weight when it was buried. He wondered if it would become another hidden dungeon that he still didn't know who made those hidden dungeons.
He entered the dungeon and to his surprise, the inside of the dungeon was untouched by dirt or rocks. A mana barrier prevented the dirt and rocks from going inside the dungeon, and the barrier wasn't a normal barrier because it was made using a complicated magic circle.
He walked deeper into the dungeon, and yet he hadn't encountered any monsters. He couldn't sense any presence from within the dungeon and thought that the dungeon wasn't like the other 2 hidden dungeons that he had explored.