The Treasure of Thundera was a cache of Thunderian artifacts, mostly magical in nature.
The Treasure of Thundera has existed for an unknown time during the ThunderCats' history. What is known though is that the Sword of Omens is a part of it's treasures, meaning it's just as ancient as the Sword is. Within the chest is a plethora of treasures entrusted to the care of the ThunderCats. Treasures of various powers and abilities. For these items to be in the hands of evil would spell doom for the ThunderCats, and the rest of the universe.
Ratilla had tried to acquire the treasure in the past using the Sword of Plun-Darr, but Jaga stopped him. When Thundera was destroyed, the chest containing the treasure survived on a part of the planet, later being found by the ThunderCat Lion-O by using the the Sword of Omens "Sight Beyond Sight" after New Thundera had formed.
- Book of Omens
- Key of Thundera
- Magical Flute
- Double Headed Dragon of Doom
- Totem of Dera
- Chain of Loyalty
- Mirror of Truth
- Bracelet of Power
- For unknown reasons, it seems the Treasure's Chest is based on the Ark of the Covenant.