You are burden by your knowledge of the arcane and must choose a both a preferred and opposition school of magic.
Effect: You choose one arcane school (or its subschool) or one elemental school as your school of focus. When you learn a mystery spell, you can choose to learn a school spell of the same level in place of your mystery spell. A school spell learned in this way is now considered a divine spell. You also choose two arcane schools or your opposite elemental school as your opposition school(s), which also applies to your oracle spells. This represents your focus on a specific area of magical knowledge. If you cast spells from your opposition school(s) you must use two spell slots of that level to cast the spell. For example, an oracle with evocation as an opposition school must expend two of her available 3rd-level spell slots to cast a fireball. You also take a –4 penalty on any skill checks made when crafting a magic item that has a spell from one of your opposition schools as a prerequisite. In addition, you suffer a –2 penalty to your saving throws against any spell from your opposition school(s) that is cast against you. The spell’s effect lasts for 1 extra round if the saving throw against that spell fails.
At 5th level, you add half your oracle class level (minimum 1) to all Knowledge skill checks and may make all Knowledge skill checks untrained.
At 10th level, you can cast any spell from your arcane school (or subschool) or elemental school of focus with a +1 caster level.
At 15th level, you gain spell resistance equal to your oracle level against all spells (arcane or divine) with the same alignment type as your own.