Locust Swarm, Rapture (CR 6)

Medium Vermin (Swarm-Fine)
Alignment: Always neutral evil
Initiative: +2 (Dex); Senses: darkvision (60-foot range)

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/Possessions: -

Source: Fiend Folio

Hypnotic Pattern (Su): Anyone looking at a swarm of rapture locusts is affected as if by a hypnotic pattern spell cast by a 6th-level sorcerer. Creatures can make a Will saving throw (DC 15) to resist this affect. This is a mind-affecting ability.

Rapture (Su): Any non-mindless creature that takes damage from a rapture locust swarm must succeed on a Will save (DC 18) or take no action for 1 full round. Creatures so affected stand motionless. This is a mind-affecting ability. Enraptured creatures are not distracted by the swarm's attack, since they do not even realize they are being harmed, but creatures that succeed on a save against the swarm's rapture are distracted.

Distraction (Ex): Any non-mindless creature vulnerable to a swarm's damage that begins its turn with a swarm in its square is nauseated for 1 round; a Fortitude save )DC 10 + 1/2 swarm's HD + swarm's Con modifier) negates the effect. Spellcasting or concentrating on spells within the area of a swarm requires a Concentration check (DC 20 + spell level). Using skills requiring patience and concentration requires a Concentration check )DC 20).

Multihued wings and scintillating exoskeletons make these deceptively beautiful creatures as fascinating as they are dangerous. Whereas many vermin swarms are easy to avoid, even the most mobile creatures often fall pray to the hypnotic colors produced by a swarm of rapture locusts. Victims stand motionless as they are overcome by euphoria while the voracious locusts feast on their bodies.