Corpulence (Longsword +1)

A viscous, noxious green poison flows continously along the blade of this curious, foreboding longsword.
Whenever you score a critical hit with this weapon, your target is overcome with virulent pestilence. Disgusting sores burst out along the victim's skin, and nausea overwhelms them. The target takes 6d6 poison damage and must make a Constitution 15 saving throw. If unsuccessful, the target is paralyzed for 1 round.