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You can launch boulders back at Trolls with the right timing (this doesn't work with Ice Trolls, of course). Probably easy to figure out but I didn't find out until I

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had to collect the second soul for the final battle

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I found a really easy way to defeat Jack in dragon form. It's not hard to get what you need and the battle will last about 3 minutes at the most.
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You'll need three spells to do it, and preferably either The Sword of Aeons are ...