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Expedition: Into Darkness co-op desync and rubber-banding (fix)

Expedition: Into Darkness server status →

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IsThisGameDown

Last checked

September 23, 2026

Expedition: Into Darkness Steam Discussions — dev reply, Antediluvian Interactive ↗

In a multiplayer run, players and enemies appear frozen or walking in place from the other player's perspective; interactions like opening a chest fail and then fire late on their own, minutes later. Gets worse the longer the session runs rather than staying constant.

Also appears as: expedition into darkness desync, expedition into darkness lag multiplayer, expedition into darkness rubber banding, expedition into darkness networking issues, expedition into darkness enemies frozen

A player reported this in detail on Steam Discussions after a session with an overseas co-op partner — connection quality fine at first, then steadily degrading over the course of the run. An Antediluvian Interactive developer replied directly in the thread, calling it "some weird buffer-leaking issue" and saying they'd look into it. That's an acknowledgement that the bug is real, not a confirmed fix — Antediluvian hasn't posted a patch note addressing it as of this writing. Expedition: Into Darkness runs on host-based peer-to-peer sessions rather than dedicated servers (patch notes distinguish "host" from "non-host" players, and Steam Discussions threads request a "dedicated server or host migration system" that doesn't exist yet), so distance and connection quality between the host and other players plausibly matters more here than in a server-authoritative game.

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What to try

  1. 01

    Have the best connection host, and stay close to the host

    Have whoever has the best connection host the session, and keep party members as geographically close to the host as practical — the reported case involved players on different continents and the desync compounded over the run.

    Unconfirmed
  2. 02

    Expect it to worsen over time; start a fresh run to reset it

    If it happens, expect it to worsen rather than resolve itself over a long session; ending and starting a fresh run resets the state players have observed helping.

    Reported
  3. 03

    Report recurrence in Steam Discussions or Discord with locations

    Report any recurrence in Steam Discussions or the official Discord with your and your party's rough locations — Antediluvian is actively looking into the underlying cause per their own reply.

    Unconfirmed

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What people are saying

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  • Nothing reported here yet.
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