I say this as someone who does not play FromSoftware games and has watched my partner play Elden Ring for 200 hours — even I could tell from across the room that the DLC was on a different level of violence. My partner, who beat Malenia first try (I know, I know), got stuck on the final boss for an entire weekend.
Is the DLC accessible to someone who beat the base game comfortably or do you need to have really mastered the combat systems?