The facts proved that with an already perfect Three Demon Core System, upgrading it into a Four Demon Core System was simply far too difficult.
It was equivalent to rebuilding an entirely new system.
No less difficult than installing an engine in a twin-barreled 20mm cannon.
There were far too many things to adjust and far too many problems that arose; press down one gourd and another ladle bobbed up. It had nearly driven Wang Wu into a mental breakdown.
At times like this, he instead had to thank the Evil Wind Bone Plague. He had endured even those utterly despairing, darkest moments. Naturally, he could not retreat now.
Yet there was still no major progress in condensing the fourth Demon Core, and Wang Wu had already spent a full year struggling with it.
Over that year, every Vitality Point he obtained had been used to run the large model for the Four Demon Core System.
Otherwise, he should have already advanced, upgraded all three Demon Cores, and brought his overall strength into the fifth grade—equivalent to a minor demon king who could claim a mountain as his own.
Of course, it would be wrong to say he had gained nothing. At the very least, Wang Wu's theory for the Four Demon Core System was nearing completion.
This was truly a path he had carved out himself. There was no experience he could draw upon.
He kept trialing and erring, distilling and improving, until he finally defined the fourth Demon Core as a service-oriented core with exceptional coordination and formidable support capabilities. Advance, and it could serve as storage; retreat, and it could act as a great dam. Standing up, it could hold back inflation; sitting down, it could ease deflation. It was a brick that could be carried wherever