Secret tunnel

There are secret tunnels under the town! They connect:

The Town Hall (under the brunch room)

The Inn (secret tunnel in room 101, goes down behind chimney)

The Tower (in courtyard)

Flavour text

You find yourself in almost pitch blackness. The air is moist and smells of dirt and moss, the floors are dirt, and a little slimy, with the occasional puddle. The walls are solid stone, and they look very old, possibly hundreds of years old.

The tunnel leading to the tower has a magic door, which requires a magical key to open, or DC30 strength / damage roll