Jailer did it
Didn’t they say eating other Proto-drakes caused his extreme mutations?
From what I read he was a “progenitor dragon”. This means his origin was unique and paved the way for proto drakes and dragonkind.
I kind of see him as the father of dragons.
It’s highly implied he did something not so good that caused galakrond to turn into what he did in the book.
Tinkers confirmed? 
galakrond had massive hungry so he started eating other drakes i think due to lack of food source? or possibly easier food source. then it just started to mutate from that. i mean you see the same thing irl with other animal species.
my guess on why he mutated tbh is because some of the other drakes were probably diseased/corrupted from magic. i mean realistically if you eat something say diseased obviously it will pass onto the thing that ate it. idk the story behind him other then that but im assuming it was intentional
Wasn’t it stated somewhere that Maldraxxus once was alive? Maybe Maldraxxus was built upon the remnants of Galakrond 
A giant corpse of a dragon. Malus Draco 
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