Dweomerburst

This spell causes any one magical barrier within range that was created by a spell of 5th level or less to explode in a burst of magical force. The barrier is destroyed, and the destructive energy of its blast streams directly away from the caster, dealing 1d6 hit points of damage per level of the spell that created it (save vs. spell to suffer only half damage) to all beings within 20 feet of the point of ignition.

All beings caught in the area affected by a dweomerburst must also make a saving throw vs. spell. Failure indicates they are stunned (reeling, unable to think coherently or perform any deliberate act) for 1d4 rounds and, if spellcasters, lose a randomly chosen spell from any spells currently memorized. Success indicates that they are merely stunned for 1 round.

The material component of this spell is a specially manufactured slender blown-glass spindle that is snapped between the caster's fingers during casting.