As specialisation helps out by providing greater spell stability and reducing mana cost, it would seem to be most helpful to be a master in evocation as you use more evocation spells in battle than you do of the conjuration based spells. Secondly, Conjuration is the other type some magician's prefer to master. More spells than any of a magician's spell are conjuration based. But because many of the conjuration based spells are used in non-crucial moments and can allow you time to med up after, this is why evocation is generally picked over conjuration. Wizard There is really no choice with wizards.
Wizards do one thing - nuke.
And they do it big time. Simply stated wizards should specialise in Evocation . I did hear of one wizard who specialised in Alteration so that they could do more successful evacs. Necromancer Necromancers have maybe the hardest choice of all. There are three classes of magic which would all be powerful additions for a necromancer.