Poison Immunity
( Book of Vile Darkness, p. 49)[General]
After prolonged exposure to a poison or toxin, the character has rendered himself immune to it.
Prerequisite
Benefit
The character is immune to one specific poison (chosen by the DMor the character's player), whether available as a blade poison, the venom of a specific creature, or one other toxin. The character also gains a +1 circumstance bonus on saving throws against other poisons.
Special
A character may take this feat multiple times, choosing a different poison each time. The +1 bonus against other poisons doesn't stack with itself, because the circumstances of each poison immunity are essentially the same.