was the poisonmaster prestige added to this handbook?
it allows you to apply metaposion effects (extend, empower, maximize, twin, quicken), gain posion secrets (change application method, contact to inhalant, anyone?), gain dr/-, become immune to all posions....
plus it is 100% official wotc material.
from the same source is a feat that grants immune to massive damage, and a psionic power that does 2d6 twice to the ability score of choice... among other goodies.