Mandrake

This plant, which roots has the shape of a human body, is surrounded by a thousand legends and is used as ingredient in many magic formulas, aphrodisiacs or medicines to fight against insomnia. However, the real effect of all these applications is not proven. On the other hand, experienced herbalists make a decoction of it which effectively prevents petrification.
A mandrake decoction gives advantage on saving throws against being paralyzed for 1 hour.