Legendary Archmage

[Urban fantasy, wild ideas, technology, another world, transmigration, high-octane combat] On Earth, I was a total pushover. In another world, I throw punches with all my might! Just wait until I return in triumph, and tell me how much I look like the person I used to be. (The way to longevity is to keep a low profile. The longer you lie low, the longer you live. Who would’ve thought I’d become a big shot a hundred years later?)