Guys, are you open the Menu Mod before you go to combat?
I think we have to open the Menu Mod at least 1 times in the beginning? When I forgot to open the Menu Mod to change DEF / DMG Multiplier and straight to combat, my operator get instant kill by the enemies too...
So usually I do it like this:
- open Arknight
- "Welcome Home, Doctor" scene
- open the Menu Mod
- change the DEF/DMG Multiplier and OK (you didn't have to change the value, just let it be default value, 1, and click OK)
- and the rest of the game works fine
hope it works for you too...