The Dark set in MM2 released during the Halloween update on October 16, 2023. That matches multiple public posts from that period referring to the new Darkness/Dark set as just released in the update.

Quick Scoop

  • The set is tied to MM2’s 2023 Halloween update.
  • Public videos and posts about the set started appearing on October 16, 2023.
  • A few follow-up videos from late October 2023 also discuss the same new set, which lines up with that release window.

Note

If you meant a different “Dark set” item name in MM2, I can narrow it down, but for the Darkness/Dark set , the release date is October 16, 2023.