[quote=@Eklispe]
Fire Emblem Awakening and Norhian path of Fates on Lunatic+

I have not sucesfully completed either, despite the tears I've spent trying to do so.
[/quote]

There is a very simple secret to beating Fire Emblem Awakening.

The avatar has an ability that when they're teamed up with an ally grants them double exp. If you make sure they are always teamed up with an alley by about level 10 they are so powerful they are capable of taking on entire armies completely on their own.