After transmigrating to a world of wizards, Eli discovers that he is immortal.
He has an infinite lifespan and an undying life.
"What? My talent is poor? Then I'll meditate for ten, a hundred, or a thousand years. Surely I'll eventually meet the requirements to advance."
"This skill is difficult? Fine, I'll study it for a few decades and see if it's really that hard."
"I can consume my life force to increase my mental power? What a deal."
"An enemy is coming? Then I'll find somewhere to hide for a thousand or ten thousand years. Once their lifespan runs out and their mental power fades, I'll come back out and roam the endless void in freedom."
This is the story of an immortal who lays low in the wizarding world, then massacres his way through countless worlds.