Mo Wuji was only in the Heavenly Immortal Stage. But with his 108 meridians completely open, and his large amount of high grade immortal crystals, the immortal spiritual energy around Mo Wuji was brimming. The immortal spiritual energy extracted from the high grade immortal crystals formed one whirlpool after another, just like Mo Wuji's whirlpool domain, as they got sucked in by Mo Wuji.
In merely half a year, Mo Wuji's cultivation rose from the intermediate Heavenly Immortal Stage to the advanced Heavenly Immortal Stage, then to the peak. He did not meet with any bottleneck, nor did he administer any immortal pills during this time.
Mo Wuji stopped cultivating as he stabilised his cultivation. He was feeling rather emotional; previously, he had concocted a huge amount of immortal pills in case he met with any bottlenecks.