I've started (re)reading The Warlord comics series from DC Comics. I dig it's Lost World vibe. Just look at that cover! Seems to be a perfect match up for ideas for a Hyperborea Campaign (AS&SH). While reading this issue the below panel just jumped out at me as an idea for my (eventual?) Hyperborea Campaign. Have a little Serpentine Wine...just watch out for the "aftertaste"...
Serpentine Wine - This evil brew is said to have been originally concocted by the foul Snake-Men. A few especially evil human magi are also believed to have also learned how to brew this sorcerous wine. Anyone drinking this dark red wine must immediately make a saving throw versus Transformation or be turned into a snake (roll a d4 : 1=asp, 2=rattlesnake, 3=spitting cobra, 4=viper). In all aspects the afflicted is for all intents and purposes a snake, they lose their intellect and any special abilities. They are also susceptible to a Snake-man's Command Serpents ability. This wicked wine is thankfully rare and difficult to brew, it acts as a variant of the Polymorph Other spell. Casting Dispel Magic will reverse the effects, as will, the death of the afflicted.
Based on a comic panel from DC Comics The Warlord. No copyright infringement is intended