Undine (水の精（ウンディーネ）, Mizu no Sei (Undīne); Literally meaning "Water Nymph") are giant water elementals whose body can liquefy. They can also live much longer than humans, as much as 500 years in difference. Just like humans they possess a gender (they can be male or female) and can use magic.
- "Undines" (Latin: Unda — a wave) are water nymphs from Germanic mythology. An Elemental is a spirit embodying one of the five elements of antiquity: Earth (solid), Water (liquid), Wind (gas), Fire (heat), Aether (quintessence).