The Hidden Monster of House Vale

In a world where strength is everything, the weak are destined to be abandoned. Lucien Vale, the talentless young master of the fallen Vale family, becomes the laughingstock of the nobility after losing his fiancée and failing to awaken any real power. Desperate to change his fate, he performs a forbidden ritual connected to the legendary Lost Atlas. But the ritual goes horribly wrong. When Lucien opens his eyes again, a different soul is staring back from within his body—one far colder, far more calculating, and far more dangerous than the original owner ever was. Armed with the mysterious Lost Atlas and a soul-devouring system, the new Lucien begins his rise through hidden relics, ancient inheritances, and merciless ambition. Because in this world— only monsters reach the top. — Description from novelcodex.org