Crystal Leaves

Thin crystal sheets, vaguely leaf-shaped. Light and fragile. They are enchanted leaves that grow on the trees of Myfenor Forest, thanks to The Elfsong sung by the High Elves of Myfenor.
The crystal leaves provide a special protection to the tree, protecting it from Fundamental Energy degradation. In great numbers, the leaves also provide protection from various effects of instability caused by the Fundamental Energy degradation. This ensures that the trees function properly and that magical mishaps from weave-based spells are much less frequent in Myfenor Forest  
Other than their appearance and their ability to protect the tree from Fundamental Energy degradation, they act like regular leaves, performing all the necessary functions for the trees to survive.