Rosemary Kirstein's Steerswoman series seems to be exactly what you're looking for:
Quote:
If you ask, she must answer. A steerswoman’s knowledge is shared with any who request it; no steerswoman may refuse a question, and no steerswoman may answer with anything but the truth.
And if she asks, you must answer. It is the other side of tradition’s contract — and if you refuse the question, or lie, no steerswoman will ever again answer even your most casual question.
And so, the steerswomen — always seeking, always investigating — have gathered more and more knowledge about the world they traveled, and they share that knowledge freely.
Until the day that the steerswoman Rowan begins asking innocent questions about one small, lovely, inexplicable object…
Her discoveries grow stranger and deeper, and more dangerous, until suddenly she finds she must flee or fight for her life. Or worse — lie.
Because one kind of knowledge has always been denied to the steerswomen:
Magic.
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(Four books published so far, and at least one more coming.)