Wind Sphere

Missile 
Create a 1 yard sphere of raging wind that spins in the air. Once shaped, the wind sphere keeps that shape until the spell expires, without concentration. Moving the sphere requires constant concentration (the sphere moves at Move 5, on the caster’s turn). 
 It does double knockback on all targets. It can extinguish normal fire within its area.

Duration: 10 seconds. 
Cost: Any amount up to your Magery level per second, for three seconds. The sphere does 1d knockback damage per energy point. 
Time to cast: 1 to 3 seconds. 
Prerequisites: Air Jet, and Shape Air.

Item 
Staff, wand, or jewelry. Usable only by mages.  
Energy cost to create: 600