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After Veronica awakened her Spirit Magic into Spiritual Queen Magic, Shade underwent an evolution as a Spirit, and according to Kireina, became "good enough" for what she had planned for him/her.
Kireina remembered how many times Shade has said that it wanted to have a physical body, how it wanted to eat food, and to enjoy the many other things that have a physical (and possibly humanoid!) body would bring.
Especially because his love for Veronica had become more than obvious at this point, and Veronica had already reciprocated more than a few times with a few gentle kisses or by touching Shade's tail and wings constantly through her phantom body, creating a slight sense of exhilaration at night.