Poison Immunity

(Champions of Ruin, page 21, DnD 3.5)

[General]

After prolonged exposure to a poison or toxin, you have rendered yourself immune to it.

Benefit

You are immune to one specifi c poison (chosen by you), whether available as a blade poison, the venom of a specifi c creature, or one other toxin. You also gain a +1 circumstance bonus on saving throws against other poisons.

Special

A character can take this feat multiple times, choosing a different poison each time. The +1 bonus against other poisons does not stack with itself.