Demiurge - Wall of Flame

Then someone tapped him. When he turned to look, it was the thief. He was focused on something in another direction completely. His wide-eyed profile looked the same as it had when Sebas had slaughtered Zero with one hit.

Climb followed his line of sight, and his eyes grew wide, too.

“A wall of fire?”

Climb nodded in response to Brain’s whisper.

If a building had been on fire, there would have been a pillar of flames. A fire like that wouldn’t have surprised Climb so much. But it wasn’t; this was a wall of flame over a hundred feet high surrounding a section of the capital. It was probably a quarter mile long or longer.

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Volume 6, Chapter 8.3

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The curling crimson flames blazed up to the heavens. They had to have been easily over a hundred feet tall. How far they stretched was impossible to gauge, but it was definitely more than a few hundred yards.

The flames rose like a flickering veil and stretched like a sash to completely enclose one area of the capital.

In shock, Evileye observed this phenomenon for the first time in her life, and a quiet male voice reached her ears.

“...The Fire of Gehenna?”

Drawn by his question, she turned toward Momon. “Wh-what in the world is that? Do you know something about that huge wall of fire, Sir Momon?”

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Volume 6, Chapter 10.1

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“The fire is similar to an illusion in some ways; for instance, it doesn’t seem to harm those who come into contact with it. According to someone who actually touched it, it doesn’t feel hot, nor does it prevent intrusions like a barrier. Apparently there aren’t any obstacles to operating inside it, either.”

At those words, some of the adventurers, mainly low-ranking ones, voiced relief.

“The culprit behind this incident is called Jaldabaoth. We’ve received reports that he is an immensely powerful, extremely cruel demon. And the leader of the Blue Roses has confirmed that there are low-level demons roaming inside the wall of flames. She reported sensing a discipline to their actions that would indicate orders from a superior.”

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Volume 6, Chapter 10.1