Immortality is born from negligence.

Aron of Lostville lived his peaceful life in a remote village, farming on his family land as did most of the common folks of Astral.
One day, an undead stampede was spotted on the edges of the mountains. The village filed a protection request to the kingdom, calling for help.
After several weeks, no help was sent, and the village got overrun by the undead. Aros was one of the only few survivors who managed to get away in time.
"Monsters aren't to blame. Those undead aren't intelligent." Aron growled, "Those nobles. They are the ones at fault." He looked at the sky.
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Hello, we're following the villain this time. Of course, as you can see from the tags, he's immortal. How he got that will occur in the first chapters, so please give them a read.