Elemental Windchurn

The powerful, swirling wind in this area makes flying difficult. The elemental turbulence crackles with energy, bringing with it a strong ozone odor.

    Effect: An area of elemental windchurn is difficult terrain for creatures that are flying, and a creature that ends its turn aloft in the area slides 1d6 squares in a random direction.
    Usage: Elemental windchurn adds a touch of chaos to a battle while discouraging flight. Use it as an excuse to ground flying monsters at the heroic tier, while at higher tiers it makes an aerial duel far less predictable.

Published in Dungeon Master's Guide 2, page(s) 59.