Musk's biggest advantage has always been the tortoise Longevity Art, and he wanted to see if it could help him out by the transformation brought about if he brokethrough again.
More importantly, he had not practiced actively for the past hundreds of thousands of years in this plane, but it was still practiced occasionally making its progress evident.
The reason for this was simple, he had already gone further as to fuse this technique with the physical path of Abyssal Tyrant body. At the moment, he ciuld feel it, a certain threshold had been reached, and he wanted to see if going past it would improve his physique.
But it was far more than just that, Musk wanted to find out if he could allow his soul to evolve faster after this breakthrough.
As long as his soul completed the transformation process faster, perhaps he might have a chance to even comprended the void Walker technique faster.