Poison Immunity
From Compendium of Worldly Lore
Needs review
Source: Book of Vile Darkness
Description: After prolonged exposure to a poison or toxin, you have rendered yourself immune to it.
Prerequisites:
The character is immune to one specific poison (chosen by the DM or 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.