• Massive portraits improvement. Hana, Kaliska, Bloodfang, Xia, Sangsue, Azar all have their full-body portraits updated to higher resolutions AND bigger models, and the positioning is much smoother. Additionally, Kaliska has had her portraits exteded to knee-up from waist-up, to match the rest of the characters. Many interactions in the game have been updated so the portraits pop-up more often, for massive visual improvements. After portraits pop-up for the first time (H-Scenes included) the game will await a button-prompt before popping other visual effects (dialogues, more portraits, etc) so the player has time to see the portraits at their leisure. Same for h-scenes.
• Kobold mines extended with a secret room. Alternative Illfang win condition added based on the secrets of said room.
• Knighting scene post-Illfang defeat has been scrapped. It has been replaced with a party event instead, where the player can complete quests, mingle with the guests and bathe in the atmosphere. Leader-class characters can potentially take Kaliska on a date/mission and/or unlock an extra outfit for her permanently, while romancing her in the party.
• Kaliska & Sangsue now have custom sprites. So do some overworld objects, including the most common herbs, alchemy scales, etc. Moreover 13 of the classic states (poison, bleeding, etc.) now have unique, custom icons so you can tell what is what.
• The fortuneteller has an original, full-body portrait and unique sprite.
• Two new player-controlled scenes/visions added after the MC is recruited by Hana and after recruiting Bloodfang, with the player playing as Hana. Get a chance to see things from her perspective, as she receives orders from Mother.
• New, custom face for MC.
• Music overhaul. A lot of old tracks have been scrapped, and new (fewer), more melodic tracks have been introduced in their place. With the choices made: 1)The game has massively improved atmosphere (in the style of Hioni's consant melody/theme). 2)Areas now have their own "theme" in a much more focused manner (again, similar to how Hioni had its own melody already).
• New room added to Imperia Academia (gift shop, has plenty of fun interactions).
• Massive crafting recipe rewrites and weapon/armor rebalances. Tens of new recipes added.
• Tons of bug fixes & small quality of life improvements.

In general 4.1.2 is a (mostly) technical update of the game, focused on making Psema smoother and more atmospheric.