Dryads (or sidhe drui) in Celtic folklore are guardians of the forests and tree spirits. Some like humans and some don't. I went out on a limb and made the dryad actually into the the tree, though they most likely can move around on their own. This was inspired by when a mountian lion in my area was killed because of an attack on a bicyclist. The human and the animal environments here are encroching on eachother and I don't feel like the animal can be held at fault for what happened. So I got depressed and the imagery I felt for the attack came out in the Dryad.