Clairvoyance is gained through the Mysticism skill.

Use with the SENSE command. When the command is used, you will gain information about the item in your right hand. Any quests that require this item will be revealed, giving you the quest giver and the general location. Your journal will be appropriately updated. Some quests require you to be at a minimum level before being revealed, and if this is the case, you will see a message indicating in the future. A journal entry will be made but with limited information. 

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