The Emperor's Soul by Brandon Sanderson

In a world where magic is wielded through the art of forgery, a skilled forger named Shai is imprisoned after attempting to steal a valuable artifact. She is given a chance to earn her freedom by undertaking an impossible task: to create a soul-forged replica of the emperor's soul within a mere hundred days, following an assassination attempt that left him brain-dead. As Shai delves into the emperor's life to craft a convincing forgery, she grapples with questions of identity, authenticity, and the nature of the soul, all while navigating the political intrigue and dangers that surround her in the imperial court.