Spiritual Treasures were classified into grades: there were the Acquired Spiritual Treasures and the Innate Spiritual Treasures. Generally speaking, Innate Spiritual Treasures were stronger than Acquired Spiritual Treasures, but it wasn't absolute. Some Acquired Spiritual Treasures, imbued with the force of merit, could surpass Low or even Medium Grade Innate Spiritual Treasures in efficacy and power.
Innate Spiritual Treasures usually came in four grades: Low Grade, Medium Grade, Superior Grade, and Top Grade. However, above the Top Grade, there occasionally appeared Superb Innate Spiritual Treasures, so unique that they were truly one of a kind.
Up to this point in the Three Realms, only two such Innate Spiritual Treasures had emerged, one being the Donghuang Chaos Bell and the other the Seven Treasures Wonderful Tree.