Day 24: After the Decay Node
The tunnel is about 5 feet wide and 7 feet high, roughly hewn with the marks of pick and chisel clearly discernible on the walls, with wooden posts supporting the walls and ceiling where required. There is no light in the tunnel and no brackets for torches or hooks for lamps on the walls It heads roughly northwards and slopes upwards at a gradient of about one in four, which is reasonably steep but not difficult to walk up.
Raven's magical rapier sheds 20ft radius light (40ft radius low light) when it is unsheathed, so Raven can see 40ft along the tunnel when she draws her rapier. Everyone else has 60ft darkvision, which is not affected by the light.
The tunnel climbs for about a mile before a tiny spot of daylight ahead marks the end of the tunnel. As you get closer you faintly start to hear the unintelligible words of a mournful song in a deep, bass voice that seems echo faintly down the tunnel. As you get close to the entrance individual words can be picked out, if not understood.
OOC: Main game map updated. The tunnel slopes up to emerge amid a tumbled mass of boulders at the base of a mountain and is not obstructed by them. Anyone exiting the tunnel will be looking northward across a narrow valley between mountains in a rocky mountain range. It is bright daylight out there and after so many days underground you will all be dazzled at first and will need at least one round for your eyes to adjust to the bright light, so presumably nobody will be charging out straight away.