Prerequisites: Ambient energy, 6th-level contractor.
Each time a creature inside the contractor's barrier uses a spell, spell-like ability, or supernatural attack (like a beam), the barrier gains a 'residual energy point.' Every creature within the barrier gains an increase to caster level equal to the barrier's residual energy points for the purposes of determining spell range (this applies for beams as well). Additionally, the contractor receives an incremental +1 bonus to Perception and Spellcraft checks per point of residual energy. When a barrier is dismissed, all residual energy is lost.