The author tried to write something absolutely amazing but in trying to do so he turned this into a mediocre one. The story seems to be inconsistent and it seems like the author didn't really plan ahead(example - soul sizer points turned from 100 to 1000 just to support the authors new declaration that ouroboros wont let a lesser bloodline exist, and I think the author added this point because he might have thought that soul of light and darkness are too burdensome or redundant or overkill to have). A good world build is necessary to make a good story but overdoing it can also ruin the story. This author overdid to the extent that the story is going at a sluggish pace. Moreover worldbuild generally means describing the cities, environment conditions, their culture, art, architecture, that worlds history etc. but this story's over extensive world build (or gibberish to put it simply) is mostly focused on the unending philosophical pondering of the MC rather than the aspects I stated above