Is it necessary to go to Dulag's tower and complete that to go to Baldurs Gate or what? I'm stuck

SPOILER
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- This is the whole steps you have to complete to get to each chapter (things you have to do before arriving to BG city):
- Chapter 2: get to Nashkell
- Chapter 3: clear Nashkell mines (get some documents)
- Chapter 4: go to the bandit camp (get some documents)
- Chapter 5: clear Cloakwood mines, then you´ll be able to go to the city.

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http://www.angelfire.com/anime2/memnoch/ertai2.gif "Captive, captive... captive in heaven" -Ertai, Captive of the Blinding Angel

Thanks a lot. I'll remember.

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Yeah - Ulgoth's beard, Wolfwere Island, Durlag's Tower - all that 'Sword Coast' stuff - are really side quests to the main story, but well worth visiting once your party is strong!

By the way what exactly does the Soultaker do?

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is the Soultaker a dagger?

It is a dagger. It does nothing for you.
SPOILER
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You come back to Ulgoth Beard. Someone steal it from you. You pursuit him but he destroys it.