The Carnán quests are a series of three optional tasks which become available in Act 2 of Middle Earth: Shadow of War. Once you've completed the "Ring of Power" quest, you'll be able to begin the Carnán storyline with its first chapter, "Violent Nature."
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This quest chain contains some boss fights, so make sure you're prepared before embarking on each chapter. Since it's optional, you can complete the Carnán storyline at any time; you don't need to do it as soon as it becomes available. If you need to do some grinding and come back later, that's perfectly fine.
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The Middle-earth games have made significant changes from the Lord of the Rings books. Not all of these are good changes.
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