The reason is simple: this heavenly tribulation can seal all laws, prohibiting divine sense.
In plain terms, this heavenly tribulation can seal the mana and soul of the tribulation crosser, preventing the use of all divine techniques, immortal skills, and flying sword artifacts; one can only rely on their physical body to endure the tribulation.
If a body refining stream cultivator encounters such a tribulation, it's certain death.
"Indeed, a heavenly tribulation cannot be so easily overcome."
Cultivation is about defying the heavens, breaking through realms is a challenge to the Heavenly Dao, and tribulations are tests and selections given by the Heavenly Dao, bound to try every possible way to stop cultivators from breaking through.
With Su Yu's current strength, a normal heavenly tribulation cannot stop him; only these special tribulations can target him.
"Thankfully, I dual cultivate both mana and body, otherwise I'd be done for."
