If a Wizard (Mage) who was apprenticed under the Pyromancy School also had the Burn Everything feat, would he ignore Fire Immunity?
Let me explain: The Pyromancy Apprentice benefit allows you to ignore fire resistance. (I'm assuming that this doesn't include Immunity.)
Level 1 Pyromancy Apprentice
You gain a +1 bonus to damager rolls with arcane fire attacks. This bonus increases to +2 at 11th level, and +3 at 21st level. Additionally, your attacks ignore fire resistance.
While the Burn Everything Feat allows you to ignore a certain amount of fire resistance, and to treat fire immunity as resist fire 25.
Your arcane fire powers ignore an amount of fire resistance equal to your Intelligence modifier. The fire resistance you ignore increases to 5 + your intelligence modifier at 11th level and to 10 + your intelligence modifier at 21st level. If the creature is immune to fire, instead treat that creature as having resist fire 25.
Combined together, would this allow a wizard to ignore Fire Immunity?