"Finally, it reached third grade."
Watching the Azure Yang Demonic Flame, whose appearance had barely changed while its power had risen dramatically, Liu Yu smiled and murmured to himself.
He did not yet know exactly how much its power had increased in advancing from second grade to third grade, since the Cultivation World currently had no precise standard for assessing it.
But through their incredibly close connection, he could clearly sense that it should be between two and three times as powerful as before.
And this was not its limit!
A higher ceiling meant that the demonic flame could continue devouring fuel to grow, and its power could keep increasing.
"I wonder how much fuel advancing from third grade to fourth grade will require?"
As this thought flashed through his mind, Liu Yu followed his connection with the Azure Yang Demonic Flame to sense the basic requirements for its next advancement.
But a moment later, his eyes widened!
"One hundred and twenty thousand."
"It actually needs one hundred and twenty thousand units of fuel. This..."
Shock flashed through Liu Yu's eyes.
Advancing from third grade to fourth grade was an enormous leap. He had already anticipated that it would require a great deal of fuel.
But a full hundred and twenty thousand was truly beyond his expectations.
Calculating on the basis that completely burning one Golden Core Middle Stage cultivator would yield four hundred units of fuel, it would take three hundred of them.
What did three hundred Golden Core cultivators mean?
The Primordial Yang Sect only had thirty-odd Golden Core cultivators. Even including its subordinate lineages and minor factions, the total would never exceed sixty.
Even adding together the Five Great Sects of Chu, along with lineage cultivators and rogue cultivators, the number would never exceed four hundred.
Moreover,