Divination School
Diviners are masters of remote viewing, prophecies, and using magic to explore the world.
Forewarned (Su): You can always act in the surprise round even if you fail to make a Perception roll to notice a foe, but you are still considered flat-footed until you take an action. In addition, you receive a bonus on initiative checks equal to 1/2 your wizard level (minimum +1). At 20th level, anytime you roll initiative, assume the roll resulted in a natural 20.
Diviner's Fortune (Sp): When you activate this school power, you can touch any creature as a standard action to give it an insight bonus on all of its attack rolls, skill checks, ability checks, and saving throws equal to 1/2 your wizard level (minimum +1) for 1 round. You can use this ability a number of times per day equal to 3 + your Intelligence modifier.
Scrying Adept (Su): At 8th level, you are always aware when you are being observed via magic, as if you had a permanent detect scrying. In addition, whenever you scry on a subject, treat the subject as one step more familiar to you. Very familiar subjects get a –10 penalty on their save to avoid your scrying attempts.
Both Forewarned and Diviner's Fortune are very nice abilities to have for any caster/class. Scrying Adept is more dependent on campaign but can be very useful given appropriate situations. I don't see any reason why Divination should be excluded from the two opposed school rule that any other specialist mage would be subject to. The abilities seem well within the level of magnitude that other schools are granted, in fact I would say that the the diviner school gets two of the best specialist school abilities in the list, but ymmv.
Ah, but in comparison doesn't every specialist gain abilities that are comparable in power?(to some extent, I agree that the diviner's abilities are truly the best, or close to it.)
And to boot, the very first and foremost reason for why to specialize are the bonus spells you gain. However the Diviner suffers greatly in that department since Divination spells are considered vastly sub-par to just about any other school.
Shouldn't that warrant a reduction in prohibited schools?
Diviners are pretty high up there on the scale of specialist powers.
That, plus still being able to cast the spells in your opposed schools if you need to means it really doesn't warrant the reduction any more. It made sense in 3.5, certainly, but not any more.