Expedition: Into Darkness co-op desync and rubber-banding (fix)
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Last checked
September 23, 2026
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.
Expedition: Into Darkness isn't playable yet — there's no service to be down.
Is Expedition: Into Darkness down right now? Live reports →What to try
- 01Have 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
- 02If 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
- 03Report 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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