Force Wall

Regular 
Creates a shimmering barrier, which physical forces and missile spells cannot cross. Only light and non-Missile spells may pass. The Force Wall is four yards high. Higher walls are possible at a proportionately increased energy cost (double for double height, etc).

Duration: 10 minutes. 
Cost: 2 per yard length to cast. Same cost to maintain. 
Prerequisite: Force Dome.

Item

• (a) Staff. Usable only by mages. 
  Energy cost to create: 300.
• (b) A Force Wall may be made permanent at an energy cost of 100 times normal.