Why do the trees on the Shadow Isles have spooky faces carved into them?
Is this a natural twisting of the landscape by dark magic?
Or did the ghosts take up trunk-carving as a hobby?
Is this a natural twisting of the landscape by dark magic?
Or did the ghosts take up trunk-carving as a hobby?
It's the souls of all those who have been damned by the ruined king. oooooohhhhhhhh spooky noises
hey man, gotta do something to past the time right? dead or not.
Though I'm not sure if the spooky faces are a thing in the actual Shadow Isles or just some silliness on the Twisted Treeline map. I can't recall seeing any trees with faces in any of the Shadow Isles art.
...
Aside from 
Its likely a result of the souls of the dead merging with the trees.