@Legolas: You gain access to the 'power' skills when your stats reach 100 (not skills). Usually, stats only increase when you invest points on level-up (one exception). Once you reach that point, you immediately have the new skill (at skill level 0).
You usually have several of these 'power' skills, if you concentrate you stat points (on level-up) on a few key stats. Usually its around 3 skills at game end, where your characters will be between level 20 and 30. I have a duo somewhere out there at level 42; at level 50, the fighter will gain his 6th power skill.
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