In Kingdom Come Deliverance 2 for Opus Magnum Side Quest, you must find the Book for the Miller. It won’t be marked, even when doing the optional objectives. You can skip all the optional objectives and head straight for the book to end the quest.
Miller’s book location:
The Miller’s book is found in the northwest corner outside Trosky Castle under the guardhouse.
Leave the castle entirely, through the front gate by the gallows. Then follow the small path around the castle until you reach the cliffs below the guard tower. There you find Nikvard’s corpse and in the corner is the book “Lightbringer’s secret“.
For more guides check out Kingdom Come Deliverance 2 Wiki.
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