The sun-eschewing tunnels, forgotten catwalks, strangely well-maintained sewer lines, and shadow-belurked (yeah, belurked) passageways hold secrets that only a certain guild can fathom, secrets that the minds of the common streetfolk will never absorb. If secrets had a natural habitat, this would be it—and so that is exactly where you go to prey upon those lore-engorged (yeah, engorged) whispers. Secrets are the very foundations of Ravnica; slink among them and enjoy the new edifices raised in your own mind.