The novel would follow a brilliant strategist who discovers temporal alchemy, the ability to send consciousness back to decision points in history.
But each time they change the past, they create a "causality debt" that must be paid. Multiple factions seek to control this power to reshape their war-torn world, while the protagonist must outthink opponents across multiple timelines while facing the philosophical question:
if you could rewrite history at the cost of who you are, should you?