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[@Cinderella Man] Hey I had some questions about your Manakete. Firstly which dragon tribe is he from? The majority of manaketes were wiped out in Marth's time. They were a once in a lifetime sighting 2000 years later when Chrom was alive and this is a good thousand years after that.

Secondly and I suppose this can be put a little bit more up to interpretation but the Dragonstones aren't some mystical device that can turn people of the manakete race into dragons. They're stones that turned the dragon race into Manaketes. A subtle distinction but an important one.

Millennium ago when the dragons ruled the world at the end of there age they were struck by a plague that started turning there own powers against them. They started to go mad and devolve into beasts. The Divine Tribe of Dragons came up with a way to seal there dragon form inside dragonstones to prevent there decline. The earth dragons refused and thus became dangerous and had to be sealed away.

Fast forwarding a couple thousand years. Manaketes in there human form are incredibly infertile. A thousand years could go by between children. When a Manakete does give birth the child's human form is unstable, there powers must be sealed within a dragonstone quickly.

In Fire Emblem: [i]Rekka no Ken[/i], the Ice Dragon siblings Ninian and Nils reveal that the dragonstones are vessels that store the crux of dragons' power, allowing them to maintain a human form.

Without the stones to keep their powers in check manaketes revert back to dragon form. So the stones wouldn't be kept in some secret vault of the tribe. Each manakete would always have one in there possession to ensure that they remained in human form.
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[@Cinderella Man] ?