It's... difficult to explain. In Spira, pyreflies are in everything. Some might argue that pyreflies are everything, for when we die, should our souls move on to the Farplane, then even our bodies become pyreflies. They look like... lights, little flying lights, leaving behind a trail of colors. Quite beautiful. But they are so much more than that. They are the... proof of life. They are life energy. Mages and summoners manipulate them in order to cast spells and give aeons form.
I suppose, then, that if the Unsent was previously a mage or a summoner, then it might be easier than usual to create their form with the pyreflies. But the strength of will comes in maintaining your sense of self, and in resisting the pull of the Farplane.
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It's... difficult to explain. In Spira, pyreflies are in everything. Some might argue that pyreflies are everything, for when we die, should our souls move on to the Farplane, then even our bodies become pyreflies. They look like... lights, little flying lights, leaving behind a trail of colors. Quite beautiful. But they are so much more than that. They are the... proof of life. They are life energy. Mages and summoners manipulate them in order to cast spells and give aeons form.
I suppose, then, that if the Unsent was previously a mage or a summoner, then it might be easier than usual to create their form with the pyreflies. But the strength of will comes in maintaining your sense of self, and in resisting the pull of the Farplane.