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Ryflier The eye color does indeed signify the type of nest the dragon was born in, you are correct. But that in itself is no small thing. One's heritage/roots are very important, even in the human world, and it has a lot to say about who you are.
Example: See the fae in my Avatar? She's the matriarch of my clan, and the very first dragon I ever purchased.
Can you tell, just by looking at her picture and nothing else, that she's got a mate from the Earth clan? That she's the mother of over 15 dragons? That she's one of the smallest clan members?
Can you tell me ANYTHING that you are absolutely sure is correct to say about her?
Yes, you can. Look at those beautiful pink eyes. You can confidently say that she was born in the Arcane realm, and that she can handle the arcane arts. That is correct.
Do you have to read that anywhere to know that? No!
All you have to do is look at her eyes. You can tell where she is from. You can tell what elements she is strong and weak against. You can tell that she won't fare well against a coli team of nature dragons, but can wreak havoc on a lightning team.
You can tell all of that just from looking at her eyes. At her heritage.
And that is why it's so important.