Keep your helmet on, there are sparrow oaks in this forest.
The hardest part about dealing with a ratwood tree is by the time you find it, there are dozens more you haven't found yet.
A coveted tree, 100 words
High above the lands of the living, where frost and howling of the wind reign, the morbid monument to a faith long dead calls the deceased on a last pilgrimage.
If you want to add a "supernatural" touch to your campaign, define the rules of magic and the universe. Make your players comfortable with those rules. Then your new supernatural creatures must then break those rules.