Since v1.04.1 was a "hotfix" for the larger patch, it inherited the massive changes from that version, including:

: Included miscellaneous text updates and corrections across the game. Context of Version 1.04

: Fixed a bug where Malenia, Blade of Miquella did not heal her HP correctly during online multiplayer sessions.

: Resolved an issue where the Elden Beast boss would not function correctly under certain circumstances. It also addressed a bug where bosses might die at unintended times.

: Corrected a bug that caused the effect duration of the Cerulean Hidden Tear to be unintentionally shortened.

For the full detailed list of changes, you can refer to the official Elden Ring Patch Notes v1.04.1 provided by Bandai Namco. ELDEN RING Patch Notes v1.04.1 - Bandai Namco

: Added an option to toggle the auto-rotate camera function on or off.

: Dozens of spells received casting speed increases and FP cost reductions.