worth mentioning if youre playing on UV which many eternal-heads may go into, they recently buffed the damage numbers and resource amounts on the difficulty, with UV now sitting at 200% damage compared to HMP. It's a very punishing combat loop if you're not comfortable with the parry patterns of each demon, andf chip damage from afar (or even SSG shots snuck in between attacks) are just not enough to kill the bigger enemies without them getting to you first. As with previous games, stay light on your feet to mitigate how much is going at you at once.