The Air Elemental was an enemy made out of air. It came in three sizes; small, medium and large. Its only attack was to throw tornadoes at the player.
Of note is that the Kukulkán, the first boss in The Second Encounter, is based off of the Air Elemental; they both throw tornadoes at the player, using the same projectile code (Twister.es); Kukulkán is also called "AirElemental" in the game's files. This makes the Air Elemental one of few scrapped enemies that reappeared in another Serious Sam game.