Janis thorn

Janis thorns are small, poisonous thorns used by the Sevateem as weaponry. Janis thorns are thin thorns about the length of a finger, with a poison coated tip. This poison causes first paralysis and then death in Humans.

Though there is no naturally occurring cure in nature, an anti-toxin was created by the Doctor using a bioanalyzer. (DW: The Face of Evil)