Can not recruit Emily, combined Power of more than 600

[gildedtalon]

Perhaps Yumi doesn't count?

[eldrasidar]

Yumi may not count if you haven't recruited her yet. Also worth checking that your base power is over 600, not your power with bonuses from equipment.

[gildedtalon]

That may have been the cause, but I went overboard and used Twaikin to recruit her yesterday