Arcane Armor +2

Feats

An armored battlemage cannot spend points from his arcane pool to enhance weapons. Instead, he can expend 1 point from his arcane pool as a swift action to grant armor he is wearing a +1 enhancement bonus for 1 minute. For every 4 magus levels he has beyond 1st, the armor gains another +1 enhancement bonus, to a maximum of +5 at 17th level. These bonuses stack with existing armor enhancement bonuses to a maximum of +5. Multiple uses of this ability don't stack. At 5th level, these bonuses can be used to add any of the following armor special abilities: balanced, bitter, fortification (heavy, light, or medium), ghost touch, invulnerability, spell resistance (13, 15, 17, or 19), or spell storing. Adding these special abilities consumes an amount of bonus equal to the ability's base price modifier. In addition, the armored battlemage can grant his armor the energy resistance special ability at the cost of a +3 bonus or the improved energy resistance special ability at the cost of a +5 bonus. These special abilities are added to any the armor already has, but duplicates don't stack. If the armor is not magical, at least a +1 enhancement bonus must be added before any other special abilities can be added. These bonuses and special abilities are decided when the arcane pool point is spent and cannot be changed until the next time the armored battlemage uses this ability. These bonuses do not function if the armor is worn by anyone other than the magus.

Arcane Armor +2 — Feats | Pathfinder: WotR Database