[@The Grey Dust]

But the lineage is known. It is its own lineage, which has always been around. I guess the very first Magna Pater was simply hatched from the fires of creation? 
If you want the full history, good luck. Waaaay too many events to even begin describing. I gave it a history, a relevant one that's easy to understand. It lives here, it eats here, everything hates it. What more could possibly be needed?

No idea what you mean by "balanced design". I don't recall identifying it as a boss fight. It doesn't play by the rules of other thinking beings. It's a patient killer that bides its time, singling out one victim at a time to personally and intimately antagonise over a long period of time. 

I say it has a fair bit more to offer than pointless two-bit romances between pretty faced palies that grew up in fine clothes and in fancy castles.