Normally, the Heavenly Tribulation has no grade, only names.
For example, the First of the Nine Heavenly Tribulations, the Second of the Nine Heavenly Tribulations, and so on.
Once a Heavenly Tribulation is graded, like a First Grade Heavenly Tribulation or a Second Grade Heavenly Tribulation, its power is extremely exaggerated, and such graded Heavenly Tribulations are often found only on high-grade continents and in the Immortal Realm.
For example, the First Grade Heavenly Tribulation is what many Heavenly Prides encounter when they break through and transcend tribulations.
If one's methods are a bit lacking or their foundation is a bit weak, they might not even encounter a First Grade Heavenly Tribulation during their breakthrough.
The Second Grade Heavenly Tribulation is what many Heavenly Prides encounter when breaking through to the Human Immortal Realm on their way to the Immortal Realm, also known as the "Ascension Tribulation"!
By the same token.
