A "v421" repack would be an unofficial naming convention used by a repacker to identify a specific compilation. While official patch notes might not use this exact number, you can expect that this version would include . Based on the game's update history, a "v421" repack might include major patches like:
: Features a deep skill tree that levels up through use, covering mining, combat, fishing, and gardening.
Below is an analysis of the game mechanics, the significance of the Deluxe Edition contents, and the technical context of the v421 repack.