
The process slowly changes the landscape into what you see, turning the ground under the flowers and trees into crystal and giving it sort of that giant's causeway hexagonal look. Not only that, but creatures who enter the woods wind up coming into contact with spores which change their entire physiology.
A crystal creature looks much like it did before its infection, but every muscle and organ of its body has been transformed into clear crystal. Through crystalline skin and bone, a faceted heart is visible, pumping translucent blood that refracts light and makes the creature glow from within. These creatures are seemingly mindless and will stay within the confines of the diamond forest, often staying as still as still as sentinels until some threat endangers the borders of the woods. They no longer need to eat or sleep, and seem deathless unless shattered.