Undine

The undine is a lesser elemental of water. It has a level of ability of 8 and a Will of 14. Bound to service, it will perform any water-related task. The lesser elementals, undines, sylphs, salamanders and earth gnomes alike, are frequently hostile toward humans, tolerating only druids, shamans, and witches and warlocks of the white or gray sort. The Elemental Magic spell Summon Elemental calls one; elementals need no triangle, so the circle takes only half an hour, and druids seal pacts with them easily.

Every spirit entity dwells on a spirit plane and must put on a physical body whenever it is called into the prime material plane.