Though the increase was only one-thousandth, it was comprehensive, encompassing Roy's physical strength, demonic power, mind, soul, Divinity, and even the Chaos Power and Void Power he possessed. All of them had increased.
Roy had originally consolidated all his power and set it as "1," but that had merely been a symbolic value. Applied to himself specifically, this one-thousandth increase was visible to the naked eye. To say nothing else, on the System Panel, his mana reserves of twenty million had directly surged by twenty thousand points in this increase. That was equivalent to the boost gained from devouring over ten thousand souls.
Just the first increase alone greatly exhilarated Roy. He knew that, as time went on, this amplification would grow stronger and stronger. Even he himself had no idea how powerful he would ultimately become.
The Symphony to the End of Reincarnation was a piece of music Roy had composed for himself. Once this piece of music was complete, no one would ever be able to defeat him again...
Once he learned that his power could continue growing even if he did nothing from then on, Roy settled down in Mardum Prison with peace of mind. He even used a small number of souls to make himself a game console, so even the dull, tedious life in Mardum Prison could no longer bother him.
There was no sunrise or sunset here, nor was there any accurate reference for the passage of time. However, this did not affect Roy. He could calculate the time through each increase in his strength. Then, after the symphony had been composed ten times—more than 6,666 days later—Roy suddenly sensed intense spatial fluctuations from above. Throwing aside his game console, he flew out of his Demon King's Hall and into mid-air, raising his head