Talk:London 1/2 AP Campaign and Challenge Quests (US)/@comment-33844581-20180303215342

I'm looking for some adive. I just finished london and the first quest(Envy). Most of my servants are under-leveled because this is a new account. Should I use the XP cards I farm on my lvl 70 Herc for a 1 or 2 lvls or should I use them on my lvl 20ish Emiya for more levels?