When I first played Metal gear Rising, I lost to sundowner 6 times because I have something known as A "Skill issue" and I have No braincells, So I painful fought for my life with No heals, Just A Sword since I was too stupid to equip Customary weapons. At 1:52 I heard the Most questionable thing ever, And I get sundowner is A Pshyco but Thats A bit to far (I yap to much.)
Statistically monsoon is the hardest boss I fought ever. Malenia was 16 tries. Vergil is 3. Armstrong is 5 tries. Monsoon took a whole week of fighting before i learned to parry. Elden dkc and sekiro are the games im gonna play next but i doubt any of them will require a week of constant fighting