Wall of Air

Wall of Air
Skill: alteration/air 15
Backlash: 19
Difficulty: 14
Effect Value: 30
Bonus Number to: effect
Range: 7 (25 meters)
Duration: 14 (10 minutes)
Cast Time: 18 (one hour)
Manipulation: control, state
This is an impressed, focused spell.
The caster mimes the shaping of a wall in the air 10
meters high by 10 meters wide (he probably will need a step ladder), he also
mimes throwing himself and other objects at the imaginary wall, stopping just
short of "impact."
The caster continues this building and striking
process for one hour. To release the spell, the caster need only thrust both
hands outward in a gesture of repelling. The air in that direction will
coagulate into a square shaped wall 10 meters high, 10 meters wide, and one
meter thick. The wall has a Toughness equal to the spell's effect.
Anything trying to pass through the area protected by the wall must do it
damage (in one round) equal to or exceeding this value. All other damage is
ignored. The caster may, however, end the duration before the ten minutes have
elapsed.