Mira stopped reading about mythical beasts until it was about time to go to the mandatory weekly classes. She was able to gather quite a bit of information regarding mythical beasts, but linking that information to Rhydian seemed difficult to her. She will need to experiment to see if Rhydian can really mutate and evolve into something even greater. But also the habits of baby mythical beasts are not like how Rhydian behaves. She's very playful, not very intelligent for such a domineering species, and as long as Mira says something is okay then it's like she throws her beastly instincts out of the window. Only parts of her body resemble these mythical beasts.
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