Purity of Body is a Monk passive feature that gives immunity to Poison damage and to being Poisoned, and makes disease have no effect.
You are Immune to Poison damage and can't be Poisoned or affected by disease thanks to the purifying ki flowing through your meridians.
Classes:
Used by creatures: Lord Amber's Bodyguard, Orpheus, Phase, and Way of the Profane Ki
Poison damage and to being 
