Dark Souls is well liked because it is difficult, but fair, and rewarding (like jump out of your chair with joy-- most games don't have that and are Zzz). A throwback to older games. You just are thrust into the world with no guide and left to sort it all out. No tutorial. It's also like live-action Dungeon and Dragons, with a bit of the reality of how it would be if your player was actually in such a world.
If you're lazy, even a skeleton warrior will impale you. That said-- they are easy.
Here is the 1st Dark Souls 3 boss, to see a fraction of the game, which is also gorgeous visually as you move through the varied lands. He cannot be skipped. His lore regards being a roadblock to weed out champions unable to even attempt to take on the chore of being an ashen one (you.) You character exists for a specific task, related to flame. A certain state of affairs in the world had to exist in order for you to rise. Your character experiences every death (unlike other games) -- and learns from them (part of why dying is important to the game) -- and every time you die the flame brings you back to hunt the great souled champions that remain in the world. If anything, the bosses are terrorized by you. They just killed you, and 20 seconds later, you're back in their area, putting lightning on your sword. By the time game 3 is out, the world is a mess (a good moral question for your character is buried here), time itself isn't always reliable, -- the world, time, and lands, have collided into a messy dumpscape. The game has a lot of indirect story telling, but people have put it together, more or less, on Youtube.
Around 5:10 timestamp makes me laugh. Surprise. I like reaction videos. Best listened to loud. I always liked how "heavy" this boss feels when fighting, although he's actually pretty easy (players voted him 5th easiest).
The Dark Souls series features the best bosses in any game, period. Ludwig being my personal favorite (Bloodborne). In Bloodborne, something like 40% of the players never made it beyond Father G (the 2nd boss, actually 1st boss, there is an "earlier" boss that is optional). He's super aggressive, and tough. When I say aggressive, I mean it. You barely pass through the fog door and he's feet from hitting you with an axe, midswing before you even get your camera focused.
This guy is easy though. Profanity, if you're at work.