Oh good, I've been waiting for this part :D I've had these prevos sitting around for a while, so I guess it's my chance to throw them in, eh?
I tried to follow the standard larva-pupa-imago route while still trying to adhere to the copper-silver-gold scheme people have wanted. It may not have been completely obvious before, but Aurumoth's wings are actually its chrysalis it controls. I tried to show that with the second stage by making it the same color as the armour, while still giving off a silver touch.
There's also a kind of life-death-rebirth theme too. Larva representing the life, pupa representing death, (noticethe completely empty eye sockets) and Aurumoth as the reborn or revived bug.
Those blue things on the second stage are lil claws. Also, this took forever to post from a phone. That is all.