The Saint Levels up Through Necromancy

Cheon Yujin, who became the world's strongest necromancer—controlling legions of corpses and called a "one-man army."
But because he was too strong, he was abandoned by both the gods and humanity. Facing death, he chose regression.
In his new life, borrowing the power of Chronos—a god who was himself abandoned by the gods—he vows to survive this time, no matter what.
Yet the moment Chronos's power was engraved into his body, the necromancer—who wielded the energy of death and was a natural enemy of the gods—turned into a saint wielding the gods' sacred power.
With two conflicting powers dwelling in a single body, Cheon Yujin, now even stronger, begins his vengeance against the gods and humanity who abandoned him in his past life!

Source: Naver Series, translated