Vermin Repellent: This vile-smelling white paste keeps vermin at bay if spread on the skin. Normal-sized (Fine) vermin avoid you. Swarms of vermin must make a DC 15 Fortitude saving throw in order to enter your square. Once applied, vermin repellent remains effective for 4 hours or until you spend 1 round washing it off.
The bug paste is not magical, but purely alchemical, in nature.
This incredibly nasty-smelling concoction is one of Otis’ creations, and indeed has proven valuable while in swampy environments.