Boss is dumb.
Battle mechanics are too complex, there is no tutorial or guide. For every enemy action you have 8 options you need to test. Every skill description is "does something magical".
Silent blast deals double damage vs Recover. Why? No idea! Not silent or silence but double damage.
Some enemy attack are special, but they all look special. Like Breath of Terror, that is not special, not physical and cannot be reflected. Enemy gets 3 turnd for free. Unless he start combat with meteor, so he get 4. So, you can get ~50+15+15% unavoidable damage.