Can I have some tips on grinding 10☆ and higher weapons. I put Lv. 2 potential on it and when I tied to get it back to 10 I couldn't. I just wasted almost 1 stack (999) of grinders plus 1.5M on grinding my Guld Milla. I would get it 10 +7 then from then on use grind protect +1s..

Is there any tips you guys can give me on grinding?