Tomes
Tomes gain experience as you complete certain activities, this is represented by a bar under the Star Bar on the top-right of the screen. Once filled you are rewarded with the stated items and the tome enters a cooldown period, standard tomes have a 24 hour cooldown and legendary tomes have a 7 day cooldown.
Tomes List
A list of Tome rewards and type.
WEEKLY
When fully charged, produces 13 hours of Gravesight, allowing you to see Fiona Catastra, sometimes found near Adventure Shrines