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The Thirty-six Thunders are the lightning of the Divine Firmament Sovereign of Thunder.
This Thunder Law originates from a major sect in the Mirror Realm, transmitted by immortals.
From low to high, they are divided into the Five Thunders, Ten Thunders, and Thirty-six Thunders.
Xu Xuan had secluded himself to break through the Ten Thunder Spell, and was currently progressing towards the Thirty-six Thunders.
The Thirty-six Thunders in the Mirror Realm are also exclusive to the masters, as they are the thunder of the Heavenly Realm, with each type of thunder representing a layer of the Heavenly Realm.
The first ten thunders of this Thunder Law are the Ten Thunder Spell, equivalent to the ten realms of mortals, and the subsequent thunders are the main act.
Even for the Divine Firmament Sect, the Thirty-six Thunders are extremely difficult to comprehend and learn.