Good fucking riddance. I hate this boss so much. Nah, he is still my favourite among the ones Lucia fights. Otherwise I wouldn't bother grinding it that much. Except I can't describe the frustration I experienced when I was doing this run. It took me about 100 tries. Just like with most bosses in DMC2, he is quite easy to no damage on Normal and Hard. But on LMD, man, this becomes a test of endurance, fuck him really.
Over half of the tries were ruined by stupid electricity balls flying in the air, which he has up to 6-7 on LMD. They slowly move around him towards you, and things become nasty when you have to close on him, and you DO have to close on him to deal some actual damage, because daggers are basically your style sustainers, which is not a thing with his argosax form, but we'll get to it shortly. Daggers literally don't do any damage to his possessed form, even when you attack in Devil Trigger. Then we have another annoying attack of his. Two attacks actually, when he decides to levitate in the air, he will either perform quick laser blasts in random directions which are easily avoided, or a laser beam which can only be avoided by going behind him. And since you can't predict which of these he will perform, you must get behind him, which means you are once again forced to close on him and risk getting hit with his stupid balls. You can force cancel his flying if you go DT and hit him with daggers 2-3 times on mid distance, which you will see me doing, cause I hate when he does this so much. But I don't recommend you doing this on a number of reasons: First, as I mentioned before, this will deal close to zero damage, better save DT to destroy his health bar up close, using melee attacks. The second is, if you do this too close to him, some daggers will not hit him, and he will still perform either of the attacks, and you'll be lucky if it's laser blasts, because laser beam will hit you 100% and multiple times. The third one is that on LMD, this cheap mofo can do it like 5 times in a row, which you'll see here. You will simply waste DT for nothing. The last attack is his stupid tentacles, another one, which ruined so many tries. He will push his tentacles through the ground and home them on you, the attack can safely be avoided only by jumping, I strongly suggest saving some DT to extend the jump, because without it, the risk of not having enough air time to avoid this attack is very high. I am not mentioning other attacks which are quite easy to avoid
As for his Argosax form, on LMD he moves around the pit much more often and will vomit his acid on you more often as well, compared to other difficulties. Initially, I did not save enough DT for this fight which made it so close to getting hit. Try to save at least 2-3 bars, you will only use it to safely fly behind him and back, to avoid being swallowed or hit with acid. Once you get his health to orange, he starts moving around and vomiting even more often. Keep hitting him with daggers to accumulate precious DT to fly around him. Oh and by the way, daggers actually deal lots of damage to his argosax form, so just don't bother hitting him with melee attacks for any purpose. Just keep tapping the dagger button instead of holding it to throw them faster. If you've scored enough Show Time!'s with possessed form, which is likely, you will get an S for style anyway. And if you manage to accumulate over half of DT gauge, feel free to quickly finish him off using it, just make sure to fly high enough because many daggers will simply hit the walls if you do this on the ground.
Despite all the effort I still didn't get an S for the mission, mainly because it took too long, which I have no problem with. Firstly because the purpose of this run was to no damage him. The second, I am pretty sure it's impossible to score an S on LMD without taking some damage and using some DT stars, since you can't destroy his health bar fast enough without getting hit by stupid electricity balls. Hope you enjoyed it.