Some wizards make bargains with beings from other realms in order to gain arcane power. These pact wizards have unparalleled access to extraplanar allies, but these bonds never come without strings attached.
This ability alters arcane bond.
At 1st level, a pact wizard must choose one additional opposition school, even if he is a universalist. A pact wizard can’t pick conjuration as an opposition school.
This ability alters arcane school.
A pact wizard enters into a bargain with an extraplanar being in order to gain increased wizardly powers. At 1st level, he selects a patron belonging to one specific subtype of outsider for which there exists an improved familiar option (such as devil or azata). The pact wizard can select a subtype of outsider even with a diametrically opposed alignment; in this case, the patron being offers the pact in an attempt to tempt or redeem the pact wizard. A pact wizard whose alignment shifts away from the chosen outsider subtype, who grossly abuses his familiar or any outsider of the chosen subtype, or who commits egregious acts against the alignment of the patron loses all the benefits of this archetype (but keeps the additional opposition school) until he receives an atonement.
Pathfinder Player Companion: Familiar Folio © 2015, Paizo Inc.; Authors: Will McCardell, Philip Minchin, Mark Seifter, and Jerome Virnich