The diary

You found a diary hanging on the branch of the tree, you threw rocks at it, and as expected, it fell, you picked it up and read it, it says "There was a creature in the woods who hunts for humans. This thing eats bullets, it doesn't die by using guns nor close range weapons, but there was one way to kill it, fire, fire is the only way to kill it, but it can result a forest fire" you thought it was nonsense.