Everything was difficult at the beginning. After all, this was his first time engraving a Will Rune, so the difficulty far surpassed that of engraving runes in the future. Not only did he have to break through the protective layer of Origin Spiritual Power, he also had to continuously leave behind his own Mental Power within it.
The further he engraved, the greater the pressure Huo Hai felt his mind bearing. Spiritual power recovered quickly, so he was not too worried about that, but Mental Power was consumed far more rapidly. If this continued, then by the time his Mental Power was exhausted, he probably would not even be able to complete half of the entire rune. It would take two or three attempts just to finish the first rune.
Leaving flaws and falling short of perfection was something Huo Hai absolutely would not allow. Yet there was no solution to it. Once his Mental Power was exhausted, no matter how hard he tried, he could not complete the rune. Huo Hai was feeling somewhat frustrated now.
Back when he had polished his Crystal Cores, he had made them too perfect, already reaching the utmost limit. The more perfect a Star Core was, the harder it was to engrave a Will Rune within it, and the greater the consumption would be.
But if they had not been perfect before, Huo Hai would not have possessed his current strength. Left with no choice, he could only persist. He would endure for as long as he could. Bit by bit, the rune became more complete. Before he knew it, one-third of it had been finished, and under Huo Hai's control, not a single error had appeared.
Yet at this moment, Huo Hai felt that his Mental Power was beginning to falter, like