OK, I've been creating a design for an Age... I'll have some sketches later, but my scanner isn't working.
The first part of the Age is what I have sketched, and I haven't thought much about the second, but here goes:
You link into a forest, with a path at your feet. The sky is an emerald green, and the sun sapphire blue. You follow the path in an S-curve- but then it dead ends. Upon exploration of the forest, you come across some kind of ancient shrine (hopefully, but with my design possibly not. But it's an inessential detail right now). Elsewhere in the forest, NNE of the path's end, there is a cave, akin to those in Minkata, found in a clearing, covered with sticks and leaves (but it's pretty obvious it's there). There is a lever on one side that looks like just another stick, but when pulled opens up the Minkata-like cave, which is the main part of the Age. That's what I have so far... there is more to come.
Is this plausible?