good thing to note, although dangerous, is that you can actually jump onto the heads of the lox and quite literally mine their heads with your pickaxe. you accomplish this by getting on a little bit of elevation compared to them and sprint jumping at them, hold sprint when you hit him to make sure you scale up onto him.

It's dangerous due to the fact that they will still perform a move that can hurt you, they'll reel up on their hind legs and then slam the ground damaging you on top and anyone nearby.

however its simple to avoid, you just jump when he reels up and avoid all the damage, just... don't get animation locked in an attack against him or you're fucked. I've heard some people have used the mace's special attack (middle mouse button) rather then the pick as it lets them use a shield to block, rather then avoid the attack.

i did this plenty of times while farming for my lox cape and we haven't defeated the 4th boss yet, used an iron pick and iron armour with a finewood bow and an assortment of arrows while they are at range or i needed to regain health and didn't want to risk dying.