Venom
From Legends of Cphera
If an opponent is hit and dealt damage by a creature's special attack, the opponent must make a DC: 20 Fortitude Save or take 1d3 points of Endurance damage. In order for venom to take effect, the damage dealt must be of the same type as the base attack. Thus, if armor converts the damage dealt by the creature's special attack, the venom has no effect.