After Some Time
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Since the day that Rust was summoned, several weeks have passed inside of Chaos Divine Realm, and he and his allies had been training diligently, raising their strength, increasing their stats, and enhancing their abilities and techniques to new levels.
Chaos has been nourishing his soul and body through the infusion of constant amounts of Cosmic Energy over time, which was slowly making him grow stronger and stronger. His comprehension of the ability to use the power of cosmic energy had been enhancing over time, and his Cosmic Core had been rising in Rank lately, making his own stats increase as well
His soul had been growing bigger and bigger too, the power of the cosmic energy dwelling within it was expanding constantly, forming into a massive sea of stars that had become his soul, something truly wondrous and incredible that was happening to him right now, and the more he trained this power, the larger his soul was becoming.