This left everyone stunned.
By instinct, they assumed the grand formation had taken effect and blocked most of the lightning's power.
But no sooner had that thought arisen than everyone within the formation underwent a drastic change in expression.
"Boom... boom..."
A chain of explosive blasts rang out throughout the formation. In an instant, the auras of every magical treasure being activated by the cultivators began to fluctuate violently.
After a brief tremor, the treasures exploded and shattered one after another amid the successive blasts.
With their magical treasures suddenly destroyed, the cultivators who had been channeling their power into them immediately suffered backlash.
One after another, they coughed up blood, their faces twisted in pain.
Their auras also plummeted sharply because of this sudden turn of events.
What was worse, many of the cultivators had been wielding their own natal magical treasures.
When natal magical treasures were damaged, the backlash was even more severe.
For a time, among the tens of thousands of figures in the formation, a full three thousand went limp and collapsed helplessly into the formation.
These cultivators had suffered especially grave injuries and could no longer continue channeling their power.
Of course, besides cultivators, there were also Demon Race demon beasts activating treasures, and they too suffered severe backlash.
Some cultivators and Demon Cultivators even perished on the spot, their Physical Bodies utterly destroyed, leaving only Nascent Souls and inner cores rushing out from their ruined flesh.
Yet before the Nascent Souls and inner cores could make another move, the black lightning that followed struck them with the force of thunder.
The black lightning had failed to do much to the cultivators' Physical Bodies.
But the instant it struck their Nascent Souls and core pellets, it directly reduced each Nascent Soul and Demonic Core to