Lords of the Myriad Heavens: From the Start, I Had a Mythic Civilization

(Worldbuilding + Highly intelligent characters + Winning over the heroine + Multiple civilizations + Not for beginners) The story begins in an elven mythological civilization, where the secondary rule is [Magic Assimilation]. Magic particles can be used to write particle-level artificial intelligence, and the setting itself is immune to every spell that alters reality. Two young gods: one is a divine guardian armor that protects all living beings, and the other is... a Nahida he stole.