On moonless nights when ghouls run wild
and ghosties dance and scream and gloat
don’t fret, don’t cry, don’t fear, dear child-
Those ghoulies fear John Bloodycoat
Better stay away from him, he’ll rip your lungs out…
His hair was perfect…
I’d like to meet his tailor…
In one region of a forest, all of the trees are identical, down to the leaves and the twigs. If the PCs carve something into one of the trees, it could mystically propigate until it covered all of the trees, or could vanish since it was not carved into the one true tree.