The three Patriarchs of the Boar-Devil clan knew the Super Saint Weapon, the Devilseal Tablet, very well.
Perhaps, most of the powerhouses from the Devil Clans thought the Devilseal Tablet was a 10,000 Inscriptions Saint Weapon that was inscribed by a human Celestial-grade Saint Inscription Master some ten thousand years ago… However, the Patriarchs knew the Devilseal Tablet knew it was not inscribed by a human Celestial-grade Saint Inscription Master!
During the later period of the Human-Devil Era, the Devilseal Tablet had made a formidable appearance and slaughtered many powerhouses from the Devil Clans and Devil Cultivators.
The weaker powerhouses from the Devil Clans and weaker Devil Cultivators were instantly destroyed by the Devilseal Tablet while those with a stronger cultivation base were suppressed and sealed by the Devilseal Tablet!
Not many knew about this secret in the Devil Clans.