Hello the Power rank system is confusing!!!! What is a rank? To rank? Hero rank? Not rank? What is this?
Check the screenshot of kevin and ren talking about them ranking up if they eat the sky grass.
No, its not confusing.
Rank is from G to SSS
Ranking up means going from one letter to the next one. So G to F or F to E.
Hero rank is another thing entirely. It ranks the top 500 heroes in the world.
I hope that clears it up.