Reincarnated Nobleman's Revenge: I'm the Great Sage Who had Everything Taken from Me, and by Using "Duplication" Will Obtain My Second Life

In a world where abusing prisoners of war is considered normal, a genius mage named Rein was bestowed the title of "Great Sage" despite being born as a prisoner. However, his land and fame were a thorn in the side of the nobles who needed to be purged. Rein was set up and killed mercilessly, but he used his magic to duplicate his own existence.