Wall of Lightning

Area
Creates a shimmering, crackling curtain of lightning around an area.
The wall is four yards high, but may be made higher by scaling the cost as the height (double for 8 yards high, triple for 12 yards high and so on).
Every turn, anyone crossing or touching the wall suffers burning damage. It impedes vision and hearing through it: -1 to these Sense rolls.

Duration: 1 minute.
Base cost: 2 to 6 to cast. Same cost to maintain. Each turn, the Wall inflicts 1d-1 burning damage for every two points of energy put into its base cost.
Prerequisite: Lightning

Item

• (a) Staff, wand, or jewelry. Usable only by mages.
  Cost to create: 500 energy and a $500 opal.
• (b) A Wall of Lightning may be made permanent at an energy cost of 100 times normal.