Locust Swarm, Rapture (CR 6)

Medium Vermin (Swarm-Fine)
Alignment: Always neutral evil
Initiative: +2 (Dex)

AC: 16 (+2 Dex, +4 natural), touch 12, flat-footed 14
Hit Dice: 10d8+20 (65 hp)
Fort +9, Ref +5, Will +3
Speed: 20 ft., fly 20 ft. (perfect)
Space: 10 ft./0 ft.
Base Attack +7; Grapple -
Attack: Swarm
Full Attack: Swarm
Damage: Swarm 2d6
Special Attacks/Actions: Distraction (DC 17), hypnotic pattern, rapture
Abilities: Str 1, Dex 14, Con 14, Int -, Wis 11, Cha 16
Special Qualities: Swarm traits, vermin traits
Feats: -
Skills: -
Advancement: -
Climate/Terrain: Any
Organization: Solitary or plague (10-40 swarms)
Treasure: -

Source: Fiend Folio

Normally harmless, locusts occasionally rise in devastating forms. A locust swarm contains approximately 10,000 individual creatures, although the swarm fights and reacts as one creature during combat. Seen from a distance, the swarm looks like a dark black cloud, although most onlookers quickly note the roiling motion of the insects that make up the swarm.

The greatest threat that locust swarms pose is their sheer size. Often covering hundreds of acres, locust swarms are usually encountered in great numbers, and even powerful creatures can succumb to wave after wave of swarming locusts.