I've been pouring over the grimoire at work (it happens, I get bored) and I found an interesting tidbit in the Ghost Fragment: Warlock's text:
"... Like the Ahamkara. Do you know the legends? The dragon that made promises? And I pulled out the fossil with a flourish -..."
Ahamkara is mentioned a few times through several other grimoire cards, but I think this is the first time it's implied that they're dragons. I know everyone's pumped about fighting a dragon, so I figured I might throw some more fuel into that fire. They existed once in the past, apparently. Maybe they'll be found somewhere else?
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So far a I could dig up is that they were brought to existence by the Traveler and hunte to extinction. I like you am trying to find out more so you're not alone!