Stench of the Dead

 
Prerequisite(s): Exposure to ghoul touch or vampiric touch spell.
 
Benefit: You exude a carrion stench that causes any creature adjacent to you to make a Fortitude save (DC 12 + your Cha modifier) or become sickened as long as it remains adjacent to you and for 1d4 rounds thereafter. You can't suppress the stench voluntarily.
 
Source: Unearthed Arcana