The Only Master of Heroic Dungeons

A broken grail, a soul of a human near on a dispersion and an essence of [--] mix together, what would the outcome would be? and how would they affect this world of dungeons and gates? -------------------- He woke up with a headache. He doesn't know how it happened, but it seems that he died and ended up bound with a previously fictional item for as long as possible. Not just that, it said that there was also an unknown presence that was bound and affecting them. The surprising thing was, he wasn't on his Earth anymore but something familiar. And this item and the unknown presence also knows the knowledge inside of him. The item wants to adapt on this new world and leave once it was strong enough to go against the unknown presence. And the latter wants an amusement. and since the unknown presence and the grail knows all of the knowledge inside his head.... [ Dungeon Building System Activated! ] He doesn't really wanted to mess with the plot.. ____________________ [ Fanfiction: Fate Grand Order + Solo Leveling + Lazy Dungeon Master ]