Well you need to bring something else to Limbeck. Something he can put the candle in (And it's not found in the caves). When on the elf ship talk to the prisoners downstairs and you'll learn of the location of king Stephen's castle. You need to go there first (not everything can be found in one place).
BTW - I put the walkthrough back up (the extras link doesn't work - don't know why), that's why I put a link in the review (I removed it before, but put it back now).
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