Controlled Immolation( Unearthed Arcana, p. 92)
If you catch on fi re, the fl ames don't hurt you.
Exposure to fi reball or delayed blast fi reball spell,
If you catch on fi re (as described on page 303 of the Dungeon Master's Guide), you take no damage from the fl ames. A creature striking you with its body or a handheld weapon takes 1d6 points of fi re damage. The fi re persists on your body for 1d4 rounds. This feat doesn't protect you from other sources of fi re dam age, whether magical or not, only from the effects of catching on fi re. It also doesn't protect your equipment from the effects of fire.