Evolving by devouring from a young dragon

Reborn on the continent of Ysera, Alduin became a rare hybrid of a black dragon and a shadow dragon. Bad news: This world is extremely unfriendly to dragons. Human-powered orbital magic cannons hang in the sky, and god-slaying mechs hundreds of meters tall run on the ground; any dragon that ventures out is blasted to smithereens. Even worse news: because of his enormous appetite, his cold-blooded dragon parents are preparing to kick him out of the house, while his dragon siblings gloat. Good news: He awakens an absolute talent with no upper limit—the All-Eating Evolution! Thus, the dragon's style drastically changes. While other dragons are robbing princesses and sleeping on gold coins, Alduin lies in the swamp, devouring everything and beginning to evolve and improve little by little. [Devour Hematite: Physical Armor +999, scales gain absolute armor resistance!] [Devour Light Stone: Light attribute desensitization successful, immune to all divine judgments!] [Devour Void Crystal: Mana reserves surge, awakening level ten dragon breath!] To survive and develop in the dragon's nest, Alduin, with his exceptionally shrewd business acumen, made a deal with his parents, then promptly kicked his arrogant, pure-blooded younger siblings into the mountains, turning them into fully automated, free mining slaves working twelve hours a day. ... Centuries later. When humanity mobilized its entire nation, deploying twelve mechanical floating cities and a massive magical fleet, preparing to utterly annihilate this legendary ultimate doomsday dragon, he looked at the sky filled with mechanical fortresses and divine phantoms, wiped his mouth, and said, "You're too kind. I was just a little hungry, and you actually delivered takeout overnight?" [An invincible story of "you are what you eat" + a flesh-and-blood myth of crushing magical machinery!]