Wizard Immortality.

Wizards are born in the pursuit of truth.
Knowledge is truth.
Truth is power.
After failing to advance to the seventh level of wizardry, Vic was unable to break free from the curse of time.
Before death arrives, he has only one choice: to become a lich with a long lifespan, but whose life level will forever remain at level six.
Vic spent a hundred years gathering materials to create the Life Box, causing his life form to degenerate into a lich.
When Vic awoke again, he was sitting in a carriage heading towards the Black Tower Wizarding Academy.
His life form also returned to that of an ordinary boy.
Although the lich's casket remains sealed deep within his spirit body, the wizard's reason and experience tell him that there is a problem with the materials used to make the lich's casket.
To unravel the secrets of rebirth and the phylactery, and to break free from the curse of time and gain immortality, Vic once again embarks on a wizarding journey in search of the truth.
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No system, ruthless and decisive. The author already has a completed masterpiece, "The Strongest Demon Hunter in All Realms," which readers looking for something to read can check out.