This spell creates a magical, glowing swarm of gnats that swarm around the targets. The swarm seems to bite and irritate the victim, though no actual damage takes place. The gnats cause the target to be outlined, as if by faerie fire, negating concealment due to invisibility, displacement, blur, non-magical darkness and similar effects. The confusing swarm hinders the target's vision, causing his opponents to gain one-quarter concealment (a 10% miss chance).
The swarm can be beaten off as a full-round action, ending the effects. If the target is interrupted (such as by an attack), the swarm remains in full effect.
Arcane material component: A handful of gnats, dead or alive.