This technical update focused on stabilizing the game for final acts:
Achieving a "True 100%" currently requires P-ranks on all levels across all difficulties, including the notoriously difficult Prime Sanctums (P-1 and P-2) and the newer Encore levels. Top Player Rankings & Speedruns
The "V1" in the designation refers to the protagonist, the machine fueled by blood. The "5" typically denotes the weapon class—the —which is the king of close-quarters devastation. But the "Top" and the "D" variant are where the story gets interesting.
Before V15d, the meta was dominated by the (for sustained DPS on the Leviathan) and the Jackhammer (for stylish one-shots). V15d introduces a damage-type recalibration.
: The word "top" in this phrasing (common in slang) also serves as a synonym for "excellent" or "the best," suggesting the reviewer was highly satisfied with the quality or design. Where to Find Similar ULTRAKILL Apparel
The was updated with options for horizontal or vertical-only tracking and now accounts for objects the player is riding.