SPOILERS
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1. Talk to either the Silver Dragon, Adalon in the dark cave (you need the light stone (iirc) from the dwarf leader. She should explain things.
2. Familiars are definately worth it. They add half of their hp to yours. You don't need to keep them out, though...if you want, put them in your pack (the best idea, and they only take up one slot).
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