The bow is a highly intelligent weapon, with memories and plans. The wielder of the bow is a brainless zombie, who is still perfectly capable of wielding the weapon. Together, they're an NPC.
Space-Faring, Hard-Rocking, Metal-Grinding, Star-Tripping, Deathdealing, Dwarves.
Doomed by the Shadow…
Send in the clowns.
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.