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Official announcement summary

Mortal Shell II: Rotten Autumn Update Brings New Content and Seasonal Treats

Team Mortal Shell's October 20, 2026 Rotten Autumn update adds free updates to Mortal Shell II, live on Steam, PS5, and Xbox: Photo Mode, an alternative soundtrack by Rotting Christ's Sakis Tolis, 15 new dungeons, Shell Shades for each Shell, 10 new Tarstones and a Sheep-specific Tarstone, Nightmode lighting presets, Overkill graphics settings, a Harbinger pumpkin helmet, an Impervious Lute skin and additional lute tracks, a lost-Shell ghost with cryptic notes, and additional polishes and bug fixes.

· Source tier: official Steam announcement

What was announced

Team Mortal Shell posted Mortal Shell II: Rotten Autumn Update Brings New Content and Seasonal Treats to Steam. The post says Rotten Autumn brings a load of free updates to the core Mortal Shell II experience, along with a few seasonal treats, and that the Rotten Autumn update is now live on Steam, PS5, and Xbox. The listed highlights are Photo Mode, a new alternative soundtrack by Rotting Christ's Sakis Tolis, 15 new dungeons, all-new Shell Shades for each Shell, 10 new Tarstones, a Sheep-specific Tarstone, new lighting presets for Nightmode, Overkill graphics settings, a Harbinger pumpkin helmet, an Impervious Lute skin and additional lute tracks, the ghost of a lost Shell haunting the land and offering cryptic notes, and additional polishes and bug fixes. The same post says there is more coming, and that there is no sheep dungeon.

Key points

  • Free updates to the core Mortal Shell II experience, plus a few seasonal treats. The Rotten Autumn update is now live on Steam, PS5, and Xbox.
  • Photo Mode.
  • New alternative soundtrack by Rotting Christ's Sakis Tolis.
  • 15 new dungeons.
  • All-new Shell Shades for each Shell.
  • 10 new Tarstones.
  • Sheep-specific Tarstone, listed as its own highlight beside the 10 new Tarstones.
  • New lighting presets for Nightmode.
  • Overkill graphics settings.
  • Harbinger pumpkin helmet.
  • Impervious Lute skin and additional lute tracks.
  • The ghost of a lost Shell haunts the land and offers cryptic notes.
  • Additional polishes and bug fixes. The post does not itemize those fixes.
  • The post says there is more coming, and that despite whatever players have heard, there is no sheep dungeon.

Official video

Context for current players

This summary follows the official Steam community announcement Mortal Shell II: Rotten Autumn Update Brings New Content and Seasonal Treats, posted by RobC and signed Team Mortal Shell, Steam gid 1846651706695184 for app 2584270 (https://store.steampowered.com/news/app/2584270/view/1846651706695184), dated October 20, 2026 (Steam news date unix 1792501509 = 2026-10-20T13:05:09Z; CST October 20, 2026 21:05). The announcement body updatetime matches that post time.

Platforms named in the post are Steam, PS5, and Xbox. The official notes do not publish a Steam build number.

The 10 new Tarstones and the Sheep-specific Tarstone are separate highlight lines. The post does not say whether the Sheep-specific Tarstone is one of the 10.

Wording follows the post: lighting presets for Nightmode, Overkill graphics settings, additional lute tracks, one ghost of a lost Shell offering cryptic notes, and additional polishes and bug fixes. The embedded video id is h62T9tp0FOA. This page does not invent dungeon names, Tarstone names, shade names, track titles, preset names, or unlisted fixes.

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More official news summaries

Source: This page is an independent summary of an official Mortal Shell II Steam announcement. Read the original for the publisher's complete wording and media.