A river of runoff rushes past your feet, constantly dragging at your shoes as you wander the vast, imposing tunnels of brick and clay and concrete. You swear you can hear the footsteps and growls of some horrible beast, though it never comes too close and you can't help but wonder if the sound of the water and the streets above are playing tricks on you.

Until you find it, laying on the ground: the massive, sharpened tooth of the great dragon patrolling the sewers.