Rat Swarm

Distraction: A creature with this ability can nauseate the creatures that it damages. Any living creature that takes damage from a creature with this ability is nauseated for 1 round; a Fortitude save (DC 10 + 1/2 creature's HD + creature's Con modifier) negates the effect. Filth fever: Swarm — injury; save Fort DC 12; onset 1d3 days; frequency 1/day; effect 1d3 Dex damage and 1d3 Con damage; cure 2 consecutive saves. The save DC is Constitution-based.