The Quantum Emperor. The Fracture, #1

Five hundred years after two young heirs split the sun to stop a war and accidentally tore reality into five drifting shards, the same fracture reopens in a canyon city called Ojo del Sol. Sixteen-year-old Joshua Reyes, a quiet fixer who has spent his life repairing what other people abandon, discovers he can rewind moments - and pays for each one with years off his own life. His eleven-year-old brother Ronnie, loud, stubborn, and carrying a carved wooden goat everywhere he goes, learns he can bend gravity itself, but every use crushes something: the ground, the world, or him.
Their powers were never meant to appear together. The bloodline law says one child at a time, never two, and never in the same house. So when both halves surface in the Reyes brothers, the empires that survived the Sundering arrive with a single verdict: the world only lived last time because one of the gifted died. This time, they intend to choose which one. But Joshua has spent his whole life fixing what others wrote off.
Ronnie has spent his whole life holding on. And when the brothers refuse the fate handed to them, the Null - the white absence that has been eating days, memories, and entire seasons - begins advancing faster, as if answering their defiance. Across canyon markets, drowned temples, obsidian armies, and turquoise sky-cities, the brothers fight to stay alive long enough to understand the prophecy carved on the gate: The sun was broken by two.
It will be mended by one.  Joshua reads that as a fault. Ronnie reads it as a lie. The world reads it as a death sentence. The Quantum Emperor is the opening chapter of a five-book epic about power that costs, family that fractures, and the terrifying question at the heart of the series: can two people share a crown built for one - or does the world end trying?