Coincidentally, Mash was my last stand during the fight vs Hinako. Since all my servants had a one time guts every turn, the main threat was Hinako's curse damage which would activate after that guts was used up if anyone died. Mash was the last one standing because I had given her a command code that removes curse status (nope, I was not prepared for this fight and only brought 3 maxed servants in the front line, 2 other low level servants in the backline for bond points + Mash for even more bond points) and she only got knocked out by direct damage and revived with guts, and thus stalled the battle till the end xD
@brsity Essentially, you get a few 1star CEs to lv50, and then use those lv50 1* CEs to upgrade the CEs you want to level up. You save inventory space and a little bit of QP that way. And iirc you need 5 lv50 1* CE to get an MLB 5* CE from lv1 to max. It would be best to wait for super and great enhancement success rates to be up.