Fly Speed
A creature with a Fly Speed can move through the air without impediment. It can move both Horizontally and Vertically, and is unaffected by Terrain effects while flying (although it could be affected by Strong Winds). Flying creatures with the Hover ability (as indicated by the creature or power) are able to hover in one place in the air, while creatures without it must be in continual flight. Creatures that can Hover may also Shift while flying.
If a flying creature is knocked Prone, it falls to the ground unless it has the ability to Hover. A flying creature that can Hover is instead disoriented (suffering the normal penalties from prone) until it uses a Shift movement to right itself. If a creature with wings receives an injury, it may also fall (GM's discretion).