Once you've exposed Wylfdene, Hjollder will be waiting to take you to Icasaracht's Isle via ship. Tell Hjollder that you're not ready to leave yet and exit the barbarian camp through the pathway in the northwest. When you hit Lonelywood, both these quests will open up.
I posted my findings with the werewolf quest in the walkthrough. Kieran offers an amulet to help resist the lycanthropy, I'm not sure if there is any more you can do.
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Buck Satan
GameBanshee
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