Tick 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. Disease: swarm (save Fort DC 21); frequency: 1/day; effect: 1d4 Con damage and target is fatigued; cure: 2 consecutive saves. The save DC is Constitution-based.