Elementals
Nature-spirits or sprites.  Every race of men on earth has believed in these hosts of elemental entities -- some visible, like men, like the beasts, like the animate plants; and others invisible. The invisible entities have been called by various names: fairies, sprites, hobgoblins, elves, brownies, pixies, nixies, leprechauns, trolls, kobolds, goblins, banshees, fawns, devs, jinn, satyrs, and so forth. The medieval mystics taught that these elemental beings were of four general kinds: those arising in and frequenting the element of fire -- salamanders; those arising in and frequenting the element air -- sylphs; those arising in and frequenting the element water -- undines; those arising in and frequenting the element earth -- gnomes.