While the official changelog for the "Exclusive" 0.12j isn't fully public, we can piece together its contents by looking at the context of the immediately preceding update, . The 0.12i hotfix was a substantial "bug-busting" operation, focused on stability and Quality of Life (QoL). It's highly likely that 0.12j built directly on these improvements, polishing the game to a new level of shine.
Malhavok's storytelling shines in v0.12j by introducing layered mythology alongside a grounded, character-driven story. Coastal Village Side Quests Queen of the Seas -v0.12j Exclusive- -Malhavok-