The warrior's footfalls echoed on the cobbles. His breath steamed in the cold, frosty air. He heard the frantic movement of assailants in the shadowed alley shuffling to surround him.
The warrior laughed. It was a bitter, dry laugh. "It won't do you any good. I feel no pain. Prepare to meet Balor."
Whilst exploring underground the PCs discover tube like tunnels stretching for miles, upon further inspection the strange tunnels seem to connect all major cities in the are, what is their purpose?