The cloud doesnt have much of a smell. It looks like fog until it’s on you and then it’s two late. A couple of sucking breaths and your chest is one fire and your eyes are bleeding. Terrible stuff, but if you think it is tough on the living, you should see what it does to the dead
PVT Thomas Quinn.
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.