Absolutely fucking hardcore I did a full hard playthrough and a 2 hour fight with this mother fffffffff
In my hurry I forgot to upgrade ANY mutagen and had to hit him a MILLION times to die.
In the final seconds I was so sweaty it was like I ran the marathon...
First two parts I ONLY hit him with the Claw drill, then the part where he shoots the ground away from you, I let him shoot away all the parts, un til he stopped doing that.
Then I did the claw spin Like 30 minutes (no joke) real careful, constantly quickly lunging towards him.
Even with immortality this was hell since i fotgot the mutagens