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Originally written by Euphemism Wrapped in an Innuendo:

Spellcraft and Magery are functionally identical. Raise whichever costs fewer skill points (so you'll eventually raise both). They increase the bonus in the formula for spell effects.

Magical Efficiency doesn't improve your spells, but it has a chance of reducing the amount of energy you expend by casting them. Since this is a random chance and not very likely even for significant amounts of Magical Efficiency, it's generally considered a nearly worthless skill. I wouldn't bother putting points in it.

—Alorael, who can also add that all skills affect mage spells and priest spells identically except for the obvious pair of skills dedicated solely to one or the other.

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Originally written by Thuryl:

A relatively unambiguous measure of how many points you've put into a stat (not counting item and trait bonuses) is how many skill points it costs to raise that stat by another point. Perhaps it'd be best to rephrase the special skill requirements in terms of how much each prerequisite costs by the time you've raised them enough to get the corresponding special skill.

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