After a week from winning the keep you go back there and speak to the major domo and he will give you a quest. And to get the other quests you have to repeat this.
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"I was born of darkness. My fathers eyes closed before mine opened. I am not of this world or the other, and I have the right to be what I am..."
Overlord of all that I behold and anything that i happen to not notice either.
Founding Hamlet of the HADB.