Golden Mortal Rank
Lex's body required enormous amounts of energy compared to other cultivators, and not only was he cultivating both Internally and Externally, but he was also cultivating his Third Eye and his Elemental Body, which required many times the amount of energy that other cultivators at the same cultivation level as him would need. He also used to cultivate Ashura before sealing him and was going to need to cultivate his Portable Sub-Dimension if he wanted to improve its size and quality.
However, that was what gave him the advantage of others at the same cultivation level as him and was there reason that he could fight against many cultivators at once and cultivators that were at a higher cultivation level than him.
Within a day, Lex's body was bursting with energy as he continuously attempted to break past the wall that blocked him from reaching the Golden Mortal Rank and he was nearing the breakthrough point as he recovered his body during the process.