Classified as both elementals and adelfoi (because they are all female-assigned at birth), undines are the ordinal elementals of water.

Aloja (family - lakes)
Asrai (plains)
Bolbe (love)
Chesme Iyesi (home - wells)
Hantu Air (nature)
Iara (ambition)
Kulshedra (storm)
Melusine (flower)
Morgen (island - avalon)
Rusalka (ice)
Selkie (moons)
Siren (music)
Topielec (swamp)
Undine (water)
Zin (boundaries - rivers)