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Rakasha had a point there, there was a big possibility that Benladra's dragon race was decided by her magic affinity, if that's the case, then Ice Dragons cannot be born with other magic than ice at the very least.
So ice for ice dragons is always there, and then fire for fire dragons, and earth for earth dragons… and Moonlight magic for moon dragons… and so on.
If that you can develop other magic affinities is another thing completely different, I guess.
"As another fellow dragon, I can tell that it is such a possibility, I've never had a child that wasn't Moon Dragon, and they always are born with just Moonlight Magic." Said Mikoto, the Moon Dragon Ancestor, a moonlight dragon ghost.
"Hm, then unless they're born with another affinity, they'll stay as their parent's race… So if Benladra has magic affinity to become a holy dragon, what's are her magic affinities to begin with?" asked Pekora.