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I usually take these skills (considering I play with mods): Knowledge (attraction, collective reward, graduate), Sorcery (secret knowledge, wisdom, mystical revelation), Summoning (the entire Lord of Magic branch), Darkness (Lord of the Mind, Weakness of Darkness, Seal of Darkness), Luck (magical resistance, soldier's luck, lucky sorcerer). Usually, people choose a more sensible build, but I like to play this way. And if I use a mentor, I take Chaos instead of Summoning (mana drain, fire, mana explosion).