Honkai: Star Rail: Reborn as a Little Zetton, Found by Feixiao

A bolt of lightning sent Bai Yu into the Honkai: Star Rail universe. When he opened his eyes, he wasn't human. Instead, he was curled up inside a black cocoon of light, transformed into an unhatched Zetton! The System told him that as long as he devoured energy and kept evolving, one day his trillion-degree fireball would make even Emanators steer clear. But right now, he had no arms or legs and could only cry, “Zetton!” The Borisin army launched a surprise attack. Feixiao cleaved the battlefield in two with one swing of her axe, then picked up the cocoon on a whim and brought it back to camp, stuffing it in her backpack as a hand warmer. From then on, the general of Yaoqing had a little “charcoal dumpling” that stole canned food, swallowed artillery fire, and took a hit for her at crucial moments. Everyone laughed and called him a mere pet, until an enemy fleet threatened them and the little Zetton swallowed an entire planet-buster cannon. The whole army stared in shock! But Feixiao had no idea that the little monster she'd held in her arms that night had heard the Aeon of Destruction whispering...