Ultimate Fortitude (3.5e Feat)
From D&D Wiki
Ultimate Fortitude [General]
+2 to fortitude saves, rolling a natural 1 on a fortitude save is not an automatic failure.
Prerequisite: Character Level 12th, Superior Fortitude
Benefit: You gain an additional +2 to fortitude saves, this bonus stacks with Great Fortitude and Superior Fortitude for a total of +6 to fortitude saves. You do not automatically fail on a roll of a natural 1 when rolling fortitude saves.