Skipping Aranvis battle for now, going to take on the Awakened/Berzerk Ezra. So I heard quite a bit of talk of this battle being quite difficult, but in actuality, this battle is actually a bit of a tedious fight.
The important thing is to watch for Ezra doing the damage immunity buff, if you atk her with the atk that she is immune to, it will cause her to trigger a counter atk that will wipe your team.
I found that while above 50% she will buff BB immunity, so do not use any BB, only normal atks and SBB, from 50~25% hp, she will do SBB damage immunity, so no SBB allowed, but you will be able to do BB and normal atks. And at under 25% hp, she will do UBB immunity, so if you want to use UBB, use it before dropping her below 25% HP.
Aside from this, just keep up the damage, and keep up your defense and mitigation, cause her atks seem to randomly deal quite a bit more at times and can knock out a unit. Especially with Korzan's LS having no def+, and both him and Haile dont have imp boosts, they are a bit lower stat.
Once you beat Berzerk Ezra, and rescue Ezra, you will receive Nyami's sphere material and the other achievement clear rewards. -- Watch live at / isanwald