The sewers of the Inner City District were incredibly complex, like a labyrinth. Some areas obviously hadn't seen a living soul in many years, but Professor Bins needed only to glance at the sand and dust, look at the construction of the walls, to know where they were, which way to go, where dangers might lurk, and where it was safe.
He even knew their history and who built them.
"These sewers were built by the Tulu Dynasty during the Third Epoch, a regime that revered beauty. They believed that the more beautiful something was, the stronger its combat prowess; art was the bane of monsters. Every creation of theirs bore a strong artistic sense, even warriors were required to fight in grand attire, and even the sewer's green bricks were no exception."
"This is a secondary tunnel built by the Momon Empire, a power that adored nature. These branch-like pathways are their handiwork."
"This is a Giant's work; only they would build such enormous sewers."