Many bosses are really hard and have racked up a dozen kills per player.
What boss has the community labeled as a pushover that you've died an embarrassing number of times to?
Crystal Sage from DS3 has killed me at least 8 times every playthrough, but every forum I've visited has made them seem easy.
Deacons of the Deep in dark souls 3. I was running a light dex build at the time (I think using a rapier?) and it was a bit of a nightmare.
The boss is supposed to be piss easy but if you don't have any sweeping attacks it quickly becomes unmanageable becauss you can't kill them fast enough and they keep spamming annoying spells.
Lady butterfly. Died 47 times against her. I'd always dodged instead of parry in soulslikes, and she kicked my ass over it.
Yeah, sekiro can really throw you off if you just see it as another souls game. Parrying was the main combat mechanic when its usually worthless in every other souls game.
And God damn, parrying is so satisfying in it. Learning how to parry properly makes you feel like a fucking samurai.
The first Headless I encountered in Sekiro. I was seeing enough progress and understanding what was being asked of me just enough to be stubborn as hell and kept trying to fight it head on, without having any knowledge yet of any helpful items that make the fight less rage-enducing.
Outside of Fromsoft, my NG+ encounter with the green swamp monster thing in Lies of P seemed SO much harder than the first time. So I'm not sure if this boss is considered easy or hard, but I didn't consider it to be very hard going in for a second time and got quite stuck for a while...