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Frank explored the dungeon with his newly raised Undead, Nezhit, alongside his three tamed monster pets, Ruby, Zhulong, and Ginseng, as he defeated any monster that they went through with quite a lot of ease.
As the monster in this dungeon was mostly of Rank 1 Initial Stage (As monsters in Terra have Mana Cores and have the same cultivation stages as human/demi-humans), it was rather easy to dispose of them, but on occasions, rare Rank 1 Middle Stage monsters would appear within the deepest areas, which required a bit more of thought into the fight.
Frank had defeated around thirty monsters on his way through the dungeon alongside his party, gathering their corpses which also contained the Mana Cores within inside of his Inventory.
As he ran through the vast corridors and mapped a large area of the dungeon, he realized just how truly vast it was.