It has the ability create life as thought it was a measly feat. With its power it can destroy worlds and create civilisations. It exists everywhere, where you step, what you see and what you breath is part of it. One can say it's not only omniscient and omnipotent, but omnipresent as well. But what is It? A deity? No, it's a dungeon. ... A young man from earth has found himself reincarnated as a dungeon. In this new world, he is now but a child. Armed with nothing else but his genius creation capability, come watch him as he struggles to survive this world where his kind are treated as nothing but tools. "Hmm? Another group of adventurers is sent to close me down?" He laughed. "Clearly, they didn't understand when i killed all of their armies... wait, that boy has a good looking soul. Why don't I turn him into a slime?" From the deepest pits of the dungeons, terrifying creatures awoke as they had been ordered by the creature they live in. Be the strongest dragons living in the deepest levels of the dungeon, to the weakest goblins only known for being cannon fodder. Each of these creatures got up to greet the newcomer, because he ordered them to.
"But before then, I need to know who 'she' is."
So Erden tapped into his connections with the goblins. Using that, he got a live feed from one of the goblin's visions. And Erden was a bit surprised at what he saw.
Right in front of a group of bowing goblins was a huge white stone. The white stone had ancient-looking colored drawings on it. In the middle of the stone was a large blue sphere, which Erden believed to his core. On the sides of his core's drawing was a row of green stickmen with different sizes, which were likely goblins and all other sub-races. Then the core is a drawing of a very big goblin. And below all that are a few drawings of goblins fighting kobolds and even giant wolves.
There was a lot of drawing on the rock, but it was clear that the dungeon core was the main focus of this whole thing. So it was clear who this 'blue mother' is.
Clearly it was him.