The Book of Omens is a legendary Book. A relic from the Treasure of Thundera that contained a great amount of knowledge and all the secrets of the ThunderCats.

The Book can be entered by using the Key of Thundera. The entity within the Book of Omens requires the Key of Thundera in order to give off it's secrets or else it will have the dragon heads wrapped around the nearby pillars attack the person in question.

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