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Since Frank had entered the Dungeon that a bit more than four hours had gone by, the night was still rather young, as Gwendolyn and everyone in the house had gone to sleep around 9 pm, and Frank only had to wait an hour for them to sleep completely, which let him leave the house at around 10 in the night.
Frank glanced at his Inventory, noticing the many icons which were the corpses and carcasses of the monsters he had hunted, thinking how much of a pain will it be to butcher each creature's Mana Cores.
Although he had not explored everything within the Dungeon, through his Mapping Skill, Frank noticed how the dungeon had a structure similar to that of a spiral, spiraling to the center, all roads that led to the center would ultimately stop in a large, circular room in the middle of the dungeon, where the supposedly Dungeon Boss Monster rested, awaiting a fitting challenger.
Check "The Protagnist's Sister Is Actually the Strongest"!