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The flaw in the pill cauldron's formation wasn't big enough to allow Azmodeus to take advantage of it by using brute force to shatter it, but it was just enough to allow natural Qi particles of heaven and earth to gather inside the pill cauldron from the outside world.
This and the Nascent Soul Realm Qi Pills were the only things that allowed his cultivation realm to constantly see improvements.
Although it wasn't anywhere near where it would be if he were murdering Spiritual Beasts and cultivators in Prometheus, it was still enough to allow for a perfect cultivation foundation.
In fact, his foundation was so sturdy that it was on the verge of becoming flawless, with not a single blemish in sight!
Even his Golden Core and Nascent Soul were a lot brighter than they would normally be if he relied purely on the assistance of the system.