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The logic behind the Shadow Dragon Ritual is actually quite clear. A ritual is a form of spell, and Ruby, who has a solid foundation in spellcasting, has created a book spirit, Sherry, that, while not an expert in this area, can be considered a scholar. She saw through the entire ritual at a glance.
In essence, it's about activating the latent Dragon's Bloodline within the scales, imitating it with Shadow Power, and finally having the caster themselves guide it, manipulating the Shadow Power to take on the form of a dragon, and using their own body and Spiritual Secret Source as the support for the existence of the Shadow Dragon.
If what the Gnoll High Priest said is true, and it has successfully performed this Ritual once before, then Ybur's conditions should also be able to meet the demands of the Ritual.