Warmaisach
I noticed a lot of similarities about Lightning is the only way, and this series, the power systems of laws and comprehension is similar, Gravis and Shang both had to strengthen their muscles bones and etc in the first realm. My theory is that this is a high world currently, and the “God” is a higher heaven, at the star god realm?!
I think it's refreshing to have a MC go through something like this. I've read (and then stopped reading) so many stories where the MC is protected by so much plot armor they hardly ever struggle, and even when they do, it's just a perception of theirs. All they have to do is put in a little more effort and BAM, no more conflict.
Really don’t think he’s going to turn into a mage, but he might become a weapon master since he wouldn’t have to fight with his body that way. Otherwise I think he can go visit the beast king of life to have his soul fixed. Definitely think this is more likely since we got some forshadowing several hundred chapters ago