The Five Elements Thunder Seal had absorbed energy from the Sea of Thunder while it was being created. The energy was used by the Five Elements Thunder spell.
Unlike the Lesser Five Elements Thunder, this attack had unleashed the full power of the Five Elements Thunder. In normal circumstances, this could only be achieved by Golden Core level cultivators.
When the five different kinds of Divine Thunder merged together, they would unlock the most primordial force in the universe. The amount of destructive power it carried made it deadlier than a blow from a Connate State warrior. The world seemed to turn upside down when the Five Elements Divine Thunder exploded.
The blast robbed reality of its color, only black and white remained.