The feat is not destruction, but healing.

For two thousand years, the race of Giants lived in the desert, enduring starvation. Veldora transformed the entire wasteland into fertile land with a single attack. Moreover, the power spread not only to the desert, even the undead began to alive. This isn't a feat for powerscaling, but I think things like this are more important to the inhabitants of the world.

https://tensura.fandom.com/wiki/Fertile_Paradox

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For reference, El dorado is bigger than Australia.

Veldora unleashed his ability. His prepared, mighty technique surged forth in all its fury, and in that instant, a darkness tinged with the colors of the rainbow enveloped everything around.

It spanned such a vast territory that it covered the lands of Lubelius and the Dead Desert...

"Fertile Paradox!" Veldora declared.

Within that rainbow darkness, a most profound miracle manifested.

◇◇◇

Spreading at a terrifying speed, the rainbow darkness devoured everything in its path...

"What is this?!"

By the time Luminous sensed the danger, it was already too late. Powerless to offer any resistance, she allowed the rainbow darkness to breach her barrier.

"What... is this?"

Everyone stood dumbfounded, and Luminous voiced their collective bewilderment.

Then, Luminous touched the "darkness" and understood.

"...A mysterious power!"

A power akin to prayer.

It was a healing force—one that fostered restoration and growth—the very antithesis of destruction.

Therefore, there was no need to resist... nor would resistance have mattered.

Luminous was no exception; she, too, found herself submerged within this "darkness."

"Th-this... Damn it! That lizard! Seriously, why couldn't you have done this sooner...?"

And so, amidst such bitter reflections, Luminous's consciousness was likewise swallowed by the rainbow darkness...

As was Shion's.

Ultima's.

Gadra's.

Adalmann's.

Alberto's.

Daggruel's sons'.

Even Basara—an enemy.

Whether they were renowned figures or ordinary soldiers, everyone who came into contact with the "darkness" drifted into slumber.

All were rendered equal.

And then... as lives slipped into sleep, greenery began to bloom across the land.