Energy Field
(Conjuration, Evocation)

Range:  60 yards + 10 yards per level
Components:  V, S, M
Duration:  5 rounds per level
Casting Time:  6
Area of Effect:  1-foot per level high cube
Saving Throw:  None

This spell creates an invisible field of energy which is impermeable to the passage of magical and psionic energies through its barriers. Thus, for example, creatures inside the area of effect are completely unaffected by spells which are cast outside the spell area. Similarly people outside are not affected by spells from inside (note that, since magic cannot pass through this barrier, creatures cannot teleport, plane shift, etc. through the barrier). Energy field does not, however, offer any physical protection whatsoever.
Spells which cause physical damage can destroy the shield but these spells must do a total damage of 6 HP per level of the wizard. Disintegrate will cause the shield to make a saving throw versus death magic at the level of the wizard. If it saves, the spell has no effect. If it fails then the spell does 1d8 points + 1 point per level of the wizard damage to the field. A magic missile actually heals the field on a one-to-one hit point basis.
The shield, if cast upon the wizard, moves with the wizard. If the spell is cast upon another creature, it may make a saving throw versus spells. If it fails its saving throw, the field follows the creature. If the saving throw is made then the spell becomes rooted to the target area. Otherwise, the spell remains stationary until the spell's duration expires.
The material component for this spell is a diamond cube of not less than 500 gp value. This cube will shatter when the spell expires or the field is brought down by spell damage.

