Why not use Divine Spirit? Phantasmal Lords are effectively evolution of spiritual entities and primarily uses spirit energy anyway. So it makes sense if we are following trend.
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How many years are left until the canon? According to my account, the main character should be more than 200 years old and it will be about 100 more until Rimuru arrives.
Spirit of Origin? I don't know if it can be called 'Origin' if there is a possibility that another person can also get it. Yes, I just read Date A Live
How about going with fate titles?
there are phantasmal beasts in type moon verse
and then there are types
or ultimate ones
u can go something like Fou-kun
just slightly below the world
Con respecto al título de la próxima evolución del MC, estaría bien con True Great Phantasmal Lord, con respecto a la hija de Mio estaría bien si fuera Shiraori de Kumo desu Ka y si agregas a otro Phantasmal Lord sería bueno que fuera yasaka de DxD como kyubi