Your body quickly adapts to toxins, especially if you willingly expose yourself to them.
Benefit: When you make a Fortitude save to resist poison, you become immune to future doses of that poison for 24 hours. Additionally, if you voluntarily expose yourself to a poison which you craft yourself, you get a +2 bonus on your Fortitude saves to resist the dose, and you become immune to that type of poison for a number of days equal to your ranks in Craft (alchemy). In either case, you become immune to future doses whether your saving throws succeed or fail.
Undefeatable: The Collected Feats Sourcebook, Copyright 2009 – 2010, Louis Porter Jr. Design, Inc. Undefeated, Copyright 2011, Louis Porter Jr. Design, Inc.