He transmigrated into Journey to the West and became Tang Sanzang. With a game System that let him level up by defeating monsters and get equipment drops, he made the demons along the pilgrimage route fear for their lives.
Sha Wujing: "Eldest Brother, this is terrible! Master got captured by a demon again!"
Tang Sanzang: "Listen up, all of you. You're not protecting me on the journey to the Western Heaven. I'm the one dragging you deadweights along, got it? Without you, I would have reached the Western Heaven long ago... I mean, fought my way there."
Note: This isn't a mindless, invincible power fantasy.