Dark Souls II
I think I said the Curse-Rotted Greatwood was the grossest Souls boss, and then I remembered this guy existed. The Rotten looks like a literal pile of crap.
When you first arrived at Majula at the beginning of the game you undoubtedly saw the giant, gaping hole in the middle. If you peeked down and saw the items, you knew that at some point in your journey you were going to have to venture down there and explore.
And at the end of all of it waits this nightmare.
The Rotten is a being composed of many hollows (similar to Nito being made up of skeletons, and the Rotten appears to possess his soul) and wields a giant cleaver that he would be all too happy to imbed into your body.
His arena is kind of neat, being surrounded by a mass of small statues he has assembled (thank goodness these don't spit poison at you), and the floor is on fire. The area leading up to him suuuucks, though.
Something I never noticed until recently was that there is a hollow sticking out of his left shoulder that mimics the Rotten's moves. A theory I like is that this being is none other than Pharros, whom we've never seen but see his handiwork all over the game.
Not a boss I remember fondly, but definitely not the worst.
58) Centipede Demon
The dubious honor of "best" boss from the Demon Ruins/Lost Izalith goes to the Centipede Demon. This creature was born from the Orange Charred Ring that the Ceaseless Discharge dropped.
I'm going to start off by saying that this is a cool looking boss. It's red coloring and white eyes make me think of Carnage from Spider-Man, and seeing all of its appendages(?) coming your way is an intimidating sight.
So what keeps this boss out of a higher ranking?
For starters, the arena isn't fun at all. It is almost completely covered in lava, leaving you with a very small section to fight on. Then the demon gets right up in your grill and blocks the whole screen. The true battle is against the camera, not the otherwise impressive boss.
This unfortunately keeps the Centipede Demon towards the bottom when I think about favorite bosses.
57) Guardian Dragon
Dark Souls II
After you make it through Aldia's Keep you come to a giant birdcage, which houses a dragon that guards the entrance to the Dragon Aerie. It seems like DS2 suffers from having a lot of random bosses that don't really have any reason for being there, and the Guardian Dragon is kind of the same way.
I tend to dislike bosses that stay out of reach for prolonged periods of time, as I prefer to get right up in their face and play aggressively. The Dragon tends to fly away from you a lot or hang on the side of the cage and spew fire your way, forcing you to play more defensively. It's basically a way toned down version of the Ancient Dragon.
That being said the cage is a cool place to fight a dragon, so I had to give it marks for that.
56) Ruin Sentinels
Dark Souls II
These guys may have been my first real challenge in the second game. I just dropped straight down to the floor of their room, which is a HORRIBLE idea.
To do this fight properly you've got to divide and conquer. Hopefully you can defeat the first one quick enough before the second decides to crash the party, and then take on the last one. The Sentinels are also encountered at Drangleic Castle as normal enemies, but I usually just run away!
I believe their lore is just that they are suits of armor imbued with souls to guard the Lost Bastille and Drangleic Castle, and serve as a true test of your skills early in the game. They certainly were for me.