After walking towards the green glow for a while, the place starts being less dim. The moisture still sticks around, however and soon it's bright and moist! It's getting warmed as they head for under the ground.

Eventually they find a cave filled with Glowing Moss on the walls, and that is what is causing the green glow. The glow doesn't go away even if you take a piece out, but touching it will make the part that touched the moss glow. This doesn't come with any immediate side-effects and will wear off in six hours or by washing.

It does, however, attract Spikeroaches. These creatures are a mix of hedgehogs and cockroaches and like to eat the moss. They will mistake anyone glowing as a meal. They also resist fire due to living in such a damp location.

There's one path they can take from this room, but they also have the opportunity to turn around if they wish.