The Forgotten Profession (Loner Book #9): LitRPG Series

Falk and his friends have pulled it off. Artyom has come back to life in Arktania, in the body of his game character, by becoming the Emissary of the God of the Dead.

But Falk himself is now locked inside the game, trapped in a pocket dimension created by Hotei, where he has to repeat the first few days in his start location over and over again. His life is in danger, but that danger comes with many new opportunities, and he knows it would be foolish not to take advantage of them. After all, this strange dimension offers him the chance to regain all his lost levels and prepare for his quest to obtain the fourth sword.