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Monsoon is a cyborg for the Desperado PMC. His ability to manipulate Lorentz Force gives him the ability to "shatter" his body into various pieces.
NOTE: This video contains strategies for completing the boss fight with an 'S' ranking on the Revengeance difficulty. It makes use of the Infinite Wig B (unlocking infinite FC to allow unending Blade Mode or Ripper Mode) to cut down on the length of each battle. The strategies shown here can be performed without using the wig, though the fight will last longer.
Monsoon is a tough boss chiefly because he is nearly invulnerable unless you manage to parry and counter him correctly. Note that Raiden has infinite Fuel Cells during this battle, and may engage Blade Mode for as long as you desire.
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This battle will no doubt test your parrying skills. Keep your guard up at all times and when you do get a chance to counter, take it but always be ready to block. Monsoon becomes open whenever his attack misses so this is your opportunity to go on the offensive. When he drops Red Phosphorus Grenades, keep parrying until the smoke clears. Due to his speed, it is difficult to block every blow in his combos, but it is quite possible if Raiden brings his weapon up at just the right moment, neither early nor late. If Raiden gets tossed into the air, perform an aerial parry to break the upcoming slam attack. Shake him off quickly if it does connect.
When you get Monsoon's health to under 70%, he will start dropping objects down on you. Just cut them up with Blade Mode to get items, including the ever useful Repair Nanopaste. Your opponent will do this every time his health drops to a certain point. The one other reason that really complicates things in this encounter is Monsoon's invincibility (purple) aura. While your attacks do not damage him in this form, they do however force his parts to split up, giving Raiden the opportunity to break through the invincibility state with a successful parry and counterattack.
If he splits in half, parry until the upper torso joins the legs, then block and counter to trigger the blade mode hit box. Cut it and attack the tiny head. If he splits into several small pieces, keep blocking and then attack as soon as Monsoon starts putting himself back together or is splitting apart. Finally, as his health goes even lower, he'll start tossing some way bigger junk. Lorentz Force cannot be chopped up straight away but it can be parried, after parrying twice there will be a blade mode prompt, alternatively just ninja run out of the away
