So I haven't found a quest regarding this yet, but curiosity on XIV's Flans.

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Originally Posted by Jynx

One of the reasons I'd love to see a bestiary make it into 2.0, lore junkies unite!

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Seconding this! What a great idea :) bestiary were always fun in casltevania :)

And even the GBA remakes of some of the FF games, though they weren't heavily detailed.

It's magic.

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Originally Posted by AdvancedWind

It's magic.

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http://www.youtube.com/watch?v=x0yQg8kHVcI

For now, this might whet your appetite:

http://eu.finalfantasyxiv.com/#/world/beastiary

The official marketing site got updated a while back. There is some nice lore in there.