Serverbound

Serverbound moves Valheim's world and AI simulation onto the dedicated server. Players keep control of their characters and character saves.

Full multiplayer testing remains incomplete. Back up worlds before use.

Install

1. Back up the world and configuration, then stop the server.
2. Install BepInExPack_Valheim 5.4.2351 and remove predecessor simulation DLLs.
3. Extract the package into the server directory. The DLL belongs at BepInEx/plugins/Serverbound/Serverbound.dll.
4. Start once to generate BepInEx/config/org.serverbound.valheim.cfg. Stop before editing it.
5. Restart and check BepInEx/LogOutput.log for Simulation: APPLIED.

Basic simulation accepts vanilla clients. ImpactfulSkills integration also needs Serverbound and the supported skill mod on participating clients. The same DLL supplies the client bridge and never runs dedicated simulation on clients. Clients without the bridge can join, but cannot supply skill bonuses.

Upgrade

Remove Serverside_Simulations.dll, Valheim_Serverside.dll, and SarkasticGG_Dedicated_Simulation.dll, including copies in nested plugin folders. Never load a predecessor alongside Serverbound.

Copy the settings you need from MVP.Valheim_Serverside_Simulations.cfg into the new config while stopped. Section and key names are unchanged. Serverbound does not migrate the file automatically.

CharacterGuard and ItemLedger have been removed. Their config settings are discarded during startup. Their old tracking files beside the world save are no longer used.

The new assembly and namespace are Serverbound; the plugin GUID is org.serverbound.valheim. Custom integrations must update old GUID, Harmony-owner, and reflected-type references. Skill RPCs and replicated keys now use the Serverbound.* prefix. ImpactfulSkills clients and the server must use matching Serverbound versions. World data keeps its format.

Supported builds

The candidate was tested with Windows Valheim 1.0.17. Guards also accept previously audited 1.0.16 and 1.0.17 Windows/Linux dedicated builds and Windows client builds. Those other builds still need native testing with this candidate. Unsupported assembly hashes are rejected.

Verified supported mods

Use DeepNorthCompat 1.2.1 for its bow and crafting fixes with ImpactfulSkills 0.21.1.

Note: If you're using ImpactfulSkills, this mod also needs to be installed on each client running ImpactfulSkills for it to work properly.

How ownership works

The server loads zones and objects around ready players and creates nearby objects first. Areas outside every player's active range can unload. Clients can retain valid ownership leases inside their areas; Serverbound does not continuously seize every object.

Player objects remain client-owned. A ship with a valid driver follows that driver's ownership. An empty ship returns to the server, with an open ship container delaying the handoff.

This increases server CPU, memory, and upload needs, especially when players explore separate areas. Remote actions wait for transport and a server frame, so the ownership change can also increase interaction latency.

Configuration

Settings are local, are not synchronized, and require a restart. The generated config describes every key.

Choose one owner for overlapping networking and simulation settings. Do not copy a pack preset into a standalone installation without checking it.

Troubleshooting

• REJECTED BUILD/INSTALLATION: check game/mod builds against the supported versions and remove predecessor DLLs. Do not bypass guards.
• Simulation: SERVERBOUND DISABLED: fix the reported takeover mismatch and restart. Stop the server if rollback reports hooks still installed.
• Repeated dungeon loading or distant objects flickering with VCP: check the world-start messages confirming spawn-queue and unload-hook removal.
• Missing skill state: check that the client has Serverbound, the supported ImpactfulSkills build, and Compatibility / ClientSkills=true.
• Slow loading or delayed interactions: compare frame times, object counts, memory, and send queues. Raising an object budget or queue size can make other delays worse.

Include the full log, game/mod versions, and reproduction steps in a report.

Attribution

Serverbound is built on ddormer's valheim-serverside and MistrCech's maintained fork.

Changelog

0.1.11

• Supports the Valheim 1.0.20 Linux dedicated build. Unsupported game detection previously prevented server simulation and the configured server FPS target from applying on this build.

0.1.10

• Supports ValheimCommunityPatch 0.36.1 while retaining the previously supported builds.

0.1.9

• Supports Valheim 1.0.20 Windows clients and dedicated servers and ImpactfulSkills 0.23.0. Previously supported builds remain supported.

0.1.8

• Makes smoke on the dedicated server near players, so smoke blocks what the server runs the same way it does on a player's machine. The server never made smoke before, so a fireplace that players saw smothered kept burning fuel and setting nearby things alight, fires under a roof never choked, and smelters, kilns, and furnaces with blocked chimneys kept working. Those stations now stop until their chimney is clear, as they do without this mod. The new [Fixes] ServerSmoke setting is on by default.
• Puts out a fire the server took over from a player once the piece, tree, or log it burns on is destroyed. The server used to keep such a fire burning in mid-air until it timed out. The new [Fixes] HandedOverFires setting is on by default.

0.1.7

• Keeps the no-spawn area around each crafting station as wide as its build range on the dedicated server, including the range each upgrade adds and any larger range set by another mod. The server used to keep the area at its default 20 m, so creatures could spawn inside a base. The new [Fixes] StationRange setting is on by default.

0.1.6

• Supports ValheimCommunityPatch 0.36.0 while retaining the previously supported builds.

0.1.5

• Applies Heightmap Unlimited JvL 2.0.2's configured terrain limits on the dedicated server. The server no longer rebuilds terrain raised or dug beyond 8 m at the 8 m limit, and no longer cuts saved terrain back to 8 m when it levels or raises ground it owns.

0.1.4

• Supports ImpactfulSkills 0.22.0 and 0.22.1, plus ValheimCommunityPatch 0.35.1. Previously supported builds remain accepted.

0.1.3

• Adds optional owner-routed customization and turret-mode requests for the audited OdinShip 0.8.7 build.
• Measures request range from ship controls or the relevant turret and reports owner rename results.
• Keeps the OdinShip integration active when simulation rolls back. Owner customization and turret permissions retain vendor behavior.
• Supports ImpactfulSkills 0.21.3 and ValheimCommunityPatch 0.35.0 while retaining the previously supported builds.
• Preserves replicated skill reads through ImpactfulSkills' new bonus-cap helper.

0.1.2

• Supports ImpactfulSkills 0.21.1 while retaining support for 0.21.0.
• Preserves StartupAccelerator's deferred configuration saves when removing obsolete settings.

0.1.1

• Removes CharacterGuard and ItemLedger, including character entry restrictions, item tracking and removal, and the characters and allow console commands.
• Removes obsolete settings during startup while preserving other configuration values.

0.1.0

• Introduces Serverbound's assembly, plugin GUID, namespaces, configuration file and version series.
• Adds VPO/VCP takeover and the ImpactfulSkills server/client bridge.
• Fixes VCP detection timing and rejects competing predecessor.
• Preserves raid transpilers, ready-peer filtering, ship validity checks and dungeon patch ordering.
• Builds and packages bin/Release/Serverbound.dll, records tested source/artifact hashes, and verifies identical bytes after a clean rebuild.
• Keeps CharacterGuard disabled and ItemLedger off.