Mortal Shell 2 PC Fixes, Crashes & Steam Deck
Quick answer: Install Balance Patch 1 on PC, verify Steam files, and cap shader stutter with an unlimited NVIDIA/AMD shader cache. If Zmey steals your weapons, unequip Grisha Remnant before retrying. Steam Deck is playable around a locked 30 FPS on medium/low with TSR.
Official promotional screenshot: Steam / Cold Symmetry / Playstack
Do this first
- Update to Balance Patch 1 on PC. It includes crash, bug, and performance fixes plus economy changes.
- Steam: verify integrity of game files.
- GPU: set Shader Cache Size to Unlimited (NVIDIA Control Panel or AMD Software). UE5 hitching on first visits is the most common stutter report.
- If the game still will not boot, delete the local shader cache and let it rebuild on the next launch.
Zmey: weapons disappear mid-fight
This is a known launch bug, not Cosmic Disease. Playstack tied it to Grisha Remnant — specifically a summoned Grisha being hit by cursed fire. Unequip Grisha Remnant before entering or retrying Zmey. A developer said a fix was ready for a later hotfix; do not assume it is already live.
- Cosmic Disease is a separate status. Seedbearer's Scripture (Night Mode route) mitigates it and can eject you from a Shell if the meter fills.
- If weapons vanish, you often cannot attack until the attempt is abandoned. Quit and retry without the remnant.
- Some players also reported item use during phase two as a trigger. If the remnant is already off and it still happens, avoid the active-item button for that attempt.
Other launch issues
- Crashes: still reported after Patch 1 on some PCs. Lower upscaling quality, disable extra overlay software, and try a borderless window.
- Save / teleport bugs: X posts on August 23 describe saves breaking after a teleport. Keep a spare manual save if the platform allows it.
- Stuck in geometry: quit to title and continue; you return to the last Beacon.
- Lazlo + Monolith crash: at least one player reported switching off Lazlo stopped a Monolith crash. Treat as unverified but cheap to test.
Steam Deck
Steam Deck HQ's launch test: the game is playable. A locked 30 FPS is smoother than chasing 40–60 in crowded fights. Use Medium or Low, TSR Balanced, and the SteamDeck=0 %command% launch option if the in-game settings menu is hidden.
Expect hitching when a new area compiles shaders. That usually calms down after the first visit.
Community Steam Deck performance first look
Unofficial player benchmark. Crash and Zmey workarounds on this page come from official patch notes, Playstack comments, and Steam Deck HQ — not from that video.
Related guides
Balance Patch 1 summary · Zmey boss guide · PC requirements · Platforms
Evidence: Patch contents follow Cold Symmetry's Balance Patch 1 post as reported by GameSpot and the official subreddit. The Zmey / Grisha Remnant workaround is the Playstack-identified launch issue. Steam Deck guidance follows Steam Deck HQ. Verified August 23, 2026; console rollout of Patch 1 was still listed as "shortly" at that time.