Lu Qingshan had been in the tower for a long time.
However, there were no methods of timekeeping within the tower, and with the ever-changing days and nights amidst various malevolent phenomena, he couldn't determine the passage of time accurately.
His journey in the Causality Tower was essentially reliving the past five years since he arrived in this world and killing all the enemies he had slain once more.
Normally, this wouldn't be a big deal.
Since he was able to kill these enemies once, killing them again shouldn't be much of a problem.
The strange thing was that these malevolent phenomena were manageable at first, but as time went on, they exploded in number and their strength increased several times over, far exceeding their original capabilities.
So, while initially he could sweep through them with ease, it gradually started to become strenuous.
What was even more challenging was that these malevolent phenomena appeared one after another, giving him no time to rest.