GrandmamaEster
The Feyrees, creatures from the Evergrown forest, have been prisoners for centuries.
The Obumbratio make sure the Feyrees are 'safe' within the cave. However, they are creatures of light, and you cannot contain light, no matter how hard you try.
A young Feyree looks inside the odd building on the side of the mouth of the cave, and finds things. A rainbow, the smell of a flower, the warmth of the sun.
And she wants to share it.