Put 1 point in Embrace Shadows. Why you ask?
INCOMING SPOILER
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Embrace Shadows has a really neat bug. Have it as your skill and right-click any NPC. As long as you're in the dark, you will turn completely invisible. Better yet, as long as you stay in the dark (caves, houses w/o candles, etc.) you can attack, STEAL FROM MERCHANTS, cast spells, etc. without being attacked!