Your stench is poisonous.

Prerequisite(s): Stench universal monster ability, immunity to poison, Improved Stench, Toughness

Benefit: The first round a creature is affected by your stench, it must also make a successful Fortitude save against the same DC to resist becoming poisoned. If you have 10 or fewer HD, this poison is identical to insanity mist; if you have 11 or more HD, the poison also adds confusion for 1 round to its effects.