Talk:4M Downloads Campaign (US)/@comment-36995966-20181018153829/@comment-34364075-20181018155241

If they're already at 90, don't bother.

Raise your low star servants. Within 2 years, they give you a huge number of quartz depending on how many strengthening quests you've finished. It's a long time, but 2x success rate and 1/2 AP on strengthening and interludes, so might as well work on it.