[quote=Sketcher]
Wouldn't dragons need to exist in that world? As far as I know, they don't.
[/quote]

Who says they don't? I didn't see no rule about how dragons couldn't exist. If talking frogs and talking dogs can exist as summons, surely talking dragons could. Plus, there's a fucking jellyfish sage. If there could be one of that, surely a Dragon sage wouldn't be out of the question. xD