Bosses come and go but these bosses overstayed their welcome with their difficulty.
Emil – Nier: Automata
The initial battle with Emil isn’t too tough (though his numerous projectiles aren’t easy to deal with). However, head into the desert and you’ll encounter his various “clones”. They’ll form one giant flying centipede of bullet hell and destruction. Even worse, their magic-based attacks can negate all your defenses so you’re left to dodge, destroy each segment and try to survive. The fact that Emil is level 99 also doesn’t help.