Elden Ring’s Malenia — widely considered the hardest optional boss in the game — uses a signature attack called Waterfowl Dance: a multi-phase slash combination that kills most builds in a single execution if not dodged correctly. Players spent hundreds of hours learning the dodge timing. Several mechanics have been found for mitigating or trivialising it.
What From Software embedded in Malenia’s lore: Waterfowl Dance is not a combat technique developed for killing. Item descriptions reference an Empyrean dance form practiced by Marika’s chosen before combat was their purpose. Malenia carries the dance as both weapon and memory — it is the most beautiful thing she knows, and she uses it to kill.
The boss fight’s camera tracks Malenia’s movement in a way that most boss cameras do not — it gives her slightly more visual centre-frame than the player, an unusual choice that the art director confirmed was deliberate. Watching Malenia fight, rather than reacting to her, produces a different experience of the encounter: it becomes a performance she is giving rather than a threat she is posing.
From Software designed the hardest boss in the game to be most fully understood as tragic when watched rather than survived.

The detail work the devs put into areas most players never visit is what separates great games from good ones.
I’ve put 200 hours into this game and never caught this. The developers really reward the obsessive players.