Stench

This is a Universal Monster Rule — a class feature gained through that class's own talent choices, not a feat you pick through normal feat selection.

A creature with the stench special ability secretes an oily chemical that nearly every other creature finds offensive. All living creatures (except those with this ability) within 30 feet must succeed at a Fortitude save (DC 10 + 1/2 the stench creature's racial HD + the stench creature's Con modifier; the exact DC is given in the creature's descriptive text) or be sickened. The duration of the sickened condition is given in the creature's descriptive text. Creatures that successfully save cannot be affected by the same creature's stench for 24 hours. A delay poison or neutralize poison spell removes the effect from the sickened creature. Creatures with immunity to poison are unaffected, and creatures resistant to poison receive their normal bonus on their saving throws.