Hardest Bosses in Soulsborne

These are the hardest bosses in the entire memorable series. This is subjective, so please chime in when you have an opinion. A little side note: I never played Demon's Souls, so please add bosses and describe them so that I may remix it to adjust to the proper ratings.
The Top Ten
1 Orphan Of Kos (Bloodborne)

Took me a week of playing 5 hours daily to beat this guy

Second Phase is pure insanity

Deserves to be #1

2 Fume Knight (Dark Souls II)
3 Ludwig, The Holy Blade (Bloodborne)
4 Nameless King (Dark Souls III)
5 Manus, Father Of The Abyss (Dark Souls)
6 Darkeater Midir (Dark Souls III)
7 Sister Friede (Dark Souls III)
8 Slave Knight Gael (Dark Souls III)
9 Flamelurker (Demon's Souls)
10 Dragonslayer Ornstein and Executioner Smough (Dark Souls)
The Contenders
11 Malenia, Blade of Miquella (Elden Ring)
12 Bloodletting Beast (Bloodborne)
13 Ancient Dragon (Dark Souls II)

This is one of those bosses with bull difficulty. While it matches that of a legendary dragon well, the run up is the worst part.

14 Abhorrent Beast (Bloodborne)
15 Lud and Zallen, the King's Pets (Dark Souls 2)
16 Knight Artorias (Dark Souls)
17 Loran Darkbeast (Bloodborne)
18 Ludwig the Accursed (Bloodborne)
19 Sir Alonne (Dark Souls II)
20 Watchdog of the Old Lords (Bloodborne)
21 Ebrietas, Daughter of the Cosmos (Bloodborne)
22 Lady Maria Of The Astral Clocktower (Bloodborne)
23 Amygdala (Bloodborne)
24 False King Allant (Demon's Souls)
25 Black Dragon Kalameet (Dark Souls)
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