I think it's possible to use noble titles perhaps. For example, lord , marquis , duke, king, emperor. I dont know much about the titles and their order but you get the idea.

Would somebody be able to become void lifeforms simply because they control void energy/merged with it ( Like Rowena's case earlier in the story )? Or do even lives born in the void become void lifeforms because they're born with all the authority of a world?

The end was very rushed so I can understand the reviews saying that. I think it does, especially as it shows how the mc of that novel discovers and builds the magical system from scratch so you can understand it pretty well. To be honest, it's more a magic developing story as the mc doesn't seem to interact much with others but is more focused on build the magic system. It depends on your likings, I liked it because of how the mc developed the magic system from scratch and how far the system can actually go according to its theory. In the final chapter when the author rushes it, he still explains how the magic system develops to some extent.

i once read a raw novel with a system similar to throne of magical arcana ( i think its name was the primordial wizard, in raws not translated i guess ) but when you reach a high enough level you can be both a god and a wizard since gods master a realm of laws where only one person can reach the top of that specific law whereas wizards understand knowledge and laws then use runes ( which were said to be projections or downgrades of laws ) in order to build spells so more people can walk on the same path in wizards and it wouldnt matter but for gods only 1 person can reach the end of each path and gods dont risk dying or stopping progress like wizards when the theory on which they built their knowldge on gets denied or proven a "relative truth" not an "absolute truth" i think maybe the author can take from that specific system