Official announcement summary

Hotfix Live Now

Cold Symmetry's October 13, 2026 Mortal Shell II hotfix makes the Tiltshot projectile spin and move forward, stops Barrage + Solnir Shard Tarstone ally damage, closes a Parasitic Stone sheep/shell exploit, reduces Final Boss HP and doubles player cosmic disease resistance, and includes summon, dungeon, audio, VFX, and performance fixes.

October 13, 2026 · Source tier: official Steam announcement

What was announced

Cold Symmetry posted Hotfix Live Now to Steam. Player and gameplay notes make the Tiltshot projectile spin and move forward, stop Barrage + Solnir Shard Tarstone from dealing damage to allies, and close the Parasitic Stone exploit when switching between sheep and shell form. Further player fixes cover unequipping Egon's Stone blocking Gloom loss, Tarstones not granting EXP for kills by player summons, Black Needle throw and infused stone being unable to aim or interact, several Slayer Seal/Punch issues, canceling Proxima's Shell ability stopping weapons from being re-equipped, Gragu being blocked from possession, Astral Clones not attacking when summoned close to an edge, Lost Clotstone for Genessa Clones using Obsidian Hammer getting stuck and staying forever, Cursed Child and Grisha summons being hit and targeted by Biosampler, Cursed Child summons being targeted by Sidearm, and spawned summons causing collision issues on big enemies and bosses (such as Grisha or Cursed Child summons launching bosses), plus force feedback tweaks and cleaned-up melee attack logic. On enemies and bosses, Final Boss HP is reduced, player cosmic disease resistance is doubled, and his grab attack has more anticipation; the notes also cover main-boss phase changes, Droeg hitboxes, Bor lock-on and Biosampler interaction, the Monolith with Proxima Biosampler, Orrem's triple slam, and Necrite run attack timing. Dungeons add 3 extra ovas in the final slice dungeon on NG+, fix The Last Siege enemy count, and address slow-streaming when seamless dungeon streaming is enabled plus double dungeon loading. UI adds multiple Mether's Breath warning prompts and fixes a soft-lock when backing out of the second warning. Audio fixes Lucian's dodge and Magdelena's unparryable slam triggering multiple times. VFX and animation add Tiel Shadow Clone and Poison Shadow Clone work, a new Droeg explosion, a Giant Spider FX pass, a shell summon handshake, and a small Gragu height tweak. Camera collisions are improved. Environment and performance notes list collision fixes, optimizations for castle stairs, mine pillars, tomb floors, and catacomb/iron maiden collision, bear trap optimization and disarm rotation, and rebuilt shader (PSO) caches and world HLODs.

Key points

Player & Gameplay: Tiltshot projectile now spins and moves forward. Fixed Barrage + Solnir Shard Tarstone dealing damage to allies. Fixed the Parasitic Stone exploit when switching between sheep and shell form. Fixed unequipping Egon's Stone preventing Gloom loss. Fixed Tarstones not granting EXP for kills by player summons. Fixed Black Needle throw and infused stone being unable to aim or interact. Fixed several Slayer Seal/Punch issues. Fixed canceling Proxima's Shell ability stopping weapons being re-equipped. Fixed an issue that blocked Gragu from being possessed. Fixed Astral Clones not attacking when summoned close to an edge. Fixed Lost Clotstone for Genessa Clones using Obsidian Hammer getting stuck and staying forever. Fixed Cursed Child and Grisha summons being hit and targeted by Biosampler. Fixed Cursed Child summons being targeted by Sidearm. Fixed spawned summons causing collision issues on big enemies and bosses, such as Grisha or Cursed Child summons launching bosses. Force feedback tweaks and changes. Cleaned up melee attack logic.
Enemies & Bosses: Final Boss HP reduced, player cosmic disease resistance doubled, and his grab attack now has more anticipation. Fixed issues around the main bosses' phase change. Improved Droeg, the Conqueror's hitboxes. Fixed Bor, the Deluded Monarch's lock-on location and Biosampler interaction. Improved how the Monolith works with Proxima Biosampler. Adjusted Orrem, the Golem's triple slam. Necrite run attack timing tweak.
Dungeons: the player can now collect 3 extra ovas in the final slice dungeon when playing NG+. Fixed the enemy count on The Last Siege. Fix for slow-streaming dungeons when seamless dungeon streaming is enabled. Fix for double dungeon loading.
UI: Mether's Breath now has multiple warning prompts. Fixed backing out of Mether's Breath's second warning soft-locking the game.
Audio: fixed Lucian, the Thirsting Knight's dodge audio. Fixed Magdelena, Lady of the Woods' unparryable slam attack audio triggering multiple times.
VFX & Animation: new VFX for Tiel's Shadow Clones, plus tweaks and fixes for Tiel's Poison Shadow Clones. New explosion version for Droeg, the Conqueror. Giant Spider FX pass with more feedback, force feedback, and camera shakes. New shell summon handshake animation and a small Gragu height tweak.
Camera: improvements to camera collisions.
Environment and Performance: environment and collision bug fixes. General optimizations, including castle stairs, mine pillars, tomb floors, and catacomb/iron maiden collision. Optimized bear traps and fixed the wrong trap rotation during the disarm animation. Rebuilt shader (PSO) caches and world HLODs.

Context for current players

This summary follows Cold Symmetry's official Steam post Hotfix Live Now, Steam gid 1846018067944953 for app 2584270 (https://store.steampowered.com/news/app/2584270/view/1846018067944953), dated October 13, 2026 (Steam news date unix 1791914191 = 2026-10-13T17:56:31Z; CST October 14, 2026 01:56).

The official notes do not name platforms (no PC/PS5/Xbox line) and do not publish a Steam build number. The same caveat applied to the September 24 hotfix.

This page does not invent platforms, build numbers, percentages, or fixes not in the notes.

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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.