Beyond new content, version 1.2.0 addressed long-standing community requests and technical bugs:

: This update added support for the fourth wave of DLC, which includes the Cindered Shadows side story, new classes (Trickster, War Monk/Cleric, Dark Pegasus, and Valkyrie), and the Abyss explorable area. Technical and Quality-of-Life Updates

: A new support conversation path was added for Bernadetta in the Crimson Flower (Black Eagles) chapter, specifically with Jeritza. Unit Appearance Customization :

The 1.2.0 update added several features that are available to all players, regardless of whether they own the Expansion Pass:

Resolved an issue where owls at the monastery stopped flying after version 1.1.0.

A new "Everyone" option allows you to change the appearance of all characters simultaneously.

Fixed a bug where the UI would sometimes fail to disappear when viewing character models.

Appearance options can now be accessed directly from the activity-selection screen on days off, not just within Byleth's Personal Quarters.

For users maintaining digital backups (NSP files), ensuring you have version 1.2.0 is critical for compatibility with the final DLC wave. On a standard console, this update is downloaded automatically when connected to the internet. For those using emulation or homebrew environments, this update file is typically installed as a separate NSP/UPD layer to ensure all Cindered Shadows content is recognized by the base game. How to Update Fire Emblem: Three Houses - Nintendo Support

Corrected various localization errors and incorrect information in certain epilogues. Managing NSP and Updates