(1.) Do 9/10 dungeons required to finish a minor tome.
(2.) After you completed step (1.) you switch to your legendary tome.
(3.) Your percentage of completion of the minor tome will be the same as your legendary tome after that.
(4.) Complete your last 1-5 dungeons in order to finish your legendary tome

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To complete this in a more timely manner do this in novice adventure to insure the fastest time.

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