Black frost

A keg of Black Frost being exposed to a special potion

Black Frost was a brand of beer sold at Jack's bar. Tired of dealing with the conceited students at UC Sunnydale, Jack laced the beer with a potion made according to a formula of his brother-in-law. It was by consumed by Buffy Summers and four other students, making them decline into a primitive state, becoming temporarily cave men. The effects eventually wore off after a day.


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