What it does: Gets in your way, mostly. You can’t move it without a Potion of Grip or an animal/item that move things for you.
How to make it:
If they’re not just lying around, you can also sprout one by tossing a Stone Seed.
Or a Rock Eater will, um … “produce” one. But then the chompy little guy will gobble it up.
What it makes:
In an elegant demonstration of the Circle of Life, Stone Seeds make Heavy Rocks which can then create more Stone Seeds when you combine a Heavy Rock with an Ancient Mortar and a Dead Tree.
The tree can also be alive, like this Oak:
Or festive, like this Pine: