Well the thing is the Allagans have basically done almost everything, almost all the advanced machinery you see in the game is Allagans lol, I don't remember the lore book talking about their language, basically the whole empire in the beginning was all about war if I remember correctly, then there was a lazy period( everyone was lazy lol) then towards their end they where all about war when their emperor was resurrected( o yea they did that too). I believe ( not 100 % sure about this) the chimeras where created by experiments with their information on Sephirot I believe and not sure about the second coil, I just glazed through that stuff, got to get either Scholar Moose to give you the information or someone on his caliber.