|Key of Thundera|
|List of all weapons & other items|
The Key of Thundera is one of the pieces of the Treasure of Thundera. This highly ornate golden key is much larger in size than any normal key. It has the ThunderCats insignia inscribed on one of its ends.
While not possessing any magical powers by itself, the Key is the only item that can unlock the Book of Omens and it cannot harm the Sword of Omens as their both part of the book. Any being that enters the Book of Omens is ordered by the Guardian of the Book of Omens to present the Key of Thundera. Failure to do so results in the intruder being showered with flames by the two giant dragon heads beside the guardian.