You summon a wasp swarm, which fills your space (up to 5 feet by 5 feet) but does not attack you. The dense cloud of vermin gives you partial concealment against ranged attacks. Any creature that makes a successful melee attack against you takes 2d6 points of swarm damage and poison from the wasp swarm, but is not affected by the swarm’s distraction ability. As a free action on your turn, you may have the swarm cling to you tightly, giving you a fly speed of 20 feet (poor maneuverability); when using the swarm to fly, it does not provide concealment or harm creatures that strike you. You can return the swarm to its protective shape as a free action on your turn.
The wasp swarm fills a 15-foot-by-15-foot space centered on you (or on 1 of your squares, if your space is larger than 1 square). Creatures in the area of the swarm are affected by it normally (including the swarm's distraction ability). Add your tier to the swarm's distraction DC.