Gusters are elves with the special ability to control wind. At Exillium, their ability is depicted by a pin showing a tree blowing in the wind. There is at least one there. Some of the things a guster can do by manipulating the air are forming tornados, and slamming and pinning people into the ground with pressure, as seen by Wylie's recount of his capture, and parting water, as the Neverseen's guster had done to enter Nightfall. It is unknown whether or not if they create the wind or if they take existing energy to move air. According to science, which is known to often be faulty in the lost cities, it would be the later. Mr. Forkle had once said that telling a guster to stay away from a tornado would be like bringing a hydrokinetic to Atlantis.