Tonic, Blight

Source Advanced Race Guide

Blight tonic increases the potency of a creature’s disease attack transmitted by physical contact, such as a dire rat’s Filth fever. The next time a creature must save against the drinker’s disease save DC, the DC for the initial infection increases by +2. The tonic lasts for 10 minutes or until the next time a creature must save against the drinker’s disease DC, whichever comes first.