Dryad is a female tree spirit from Greek Myth, who were known to protect the trees in which they lived. Part of the reason for it is that they would die with if their tree perished, as if she was the soul of the tree.:

Dryad is a female tree spirit from Greek Myth, who were known to protect the trees in which they lived. Part of the reason for it is that they would die with if their tree perished, as if she was the soul of the tree.