Nymphs are the minor deities that care for nature. The most mentioned 'varieties' are dryads (tree nymphs) and naiads (water nymphs). They are Greek/roman deities, but only minor ones, usually dedicated to a specific tree/body of water. They often mated or served with higher gods or mated with mortals to produce demi-god offspring, e.g. Achilles was the son of a sea nymph, Thetis, and a mortal King.
