What it does: You can make an offering to the Forest Shrine to set up a checkpoint so that you don’t have to start over if you fail.
How to make it:
You can’t. It is eternal.
What it makes:
If you can line things up just right, throwing a Forest Shrine at a Doom Spirit will turn it into a harmless Rabbit.
You can get a mean old Boar if you combine the Forest Shrine with a Willowisp.
Or you can make a cranky, stinging Bee with a Lodestone.
Chuck Leshy in there, and an Evil Raccoon will emerge.
You can also get all spooky if you want; combine a Hawk and the Forest Shrine to make a Willowisp.