"The Universe is ninety-nine percent sky and one percent island. In the Sky, the wind rules"
The Wind Tower is a defensive unit. Place it between a friendly unit and enemy fire. The attacking unit will attack the wind tower. On three sides it takes normal damage, but on one side (the curved face) it is invulnerable. As you're preparing to place it, right-click to face the invulnerable side north, south , east or west. It is still susceptible to air attack..