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Ruby had been slowly growing up since he hatched around three years ago. Wyverns are dragon-type monsters, which means they grow very slow by natural means. I could had infected him with Miasma to make him mutate into a monstrous wyvern, but that would probably make him uncontrollable. And for the evolution I want him to take, I don't want to take the cheapest of roads. However, leveling is different, every living being in the world can level up, even monsters.
When monsters level up to their level cap, instead of Ranking Up a Talent they don't possess, they evolve into a higher Rank. Currently, Ruby's a Rank F Baby Blood Wyvern. Monsters can naturally grow over the years and evolve through age, so he would eventually, around five years of age, reach his young adult stage and probably become E Rank, and then adult stage would be D Rank.
