Seamless Co-op (Elden Ring)

Overhaul to the co-operative aspect of Elden Ring's multiplayer

Requirements

This mod does not have any known dependencies other than the base game.

Permissions and credits

Credits and distribution permission

• Other user's assets All the assets in this file belong to the author, or are from free-to-use modder's resources
• Upload permission You are not allowed to upload this file to other sites under any circumstances
• Modification permission You must get permission from me before you are allowed to modify my files to improve it
• Conversion permission You are not allowed to convert this file to work on other games under any circumstances
• Asset use permission You must get permission from me before you are allowed to use any of the assets in this file
• Asset use permission in mods/files that are being sold You are not allowed to use assets from this file in any mods/files that are being sold, for money, on Steam Workshop or other platforms
• Asset use permission in mods/files that earn donation points You are not allowed to earn Donation Points for your mods if they use my assets

This author has not provided any additional notes regarding file permissions

This author has not credited anyone else in this file

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Translations

No translation available on the Nexus

Mirrors

Changelogs

• • Removed test code causing problems with enemy damage

• • Scaled back some anticheat measures for invasion matchmaking to allow for some QoL and performance improvement mods
  • Fixed an issue which caused alternative launchers (such as Mod Engine 2) to severely restrict user matchmaking
  • Fixed a bug which could cause inappropriate world event flag synchronisation when invading other players with more progression
  • Fixed a critical bug which caused some world event flags to inappropriately linger between reloads causing bugs with certain boss fights (e.g. Fire Giant, Radagon, etc..)
  • Added score count into the PvE hoard / boss rush modes

• • Fixed a bug introduced in 1.8.6 which caused critical hits not function correctly

• • Added PvE enemy horde modes (accessible at Limgrave Arena)
  • Added PvE boss rush mode (accessible at the Table of Lost Grace)
  • You can now perform a critical strike players in PvP when you knock them off horseback
  • Fixed a bug that could occasionally cause mismatched regulation files to connect with each other under certain conditions

• • Compatibility with game version 1.14
  • Added new item: Dried Fingers - This is indended for people who wish to engage more with PvP
  • Disabled safe zones when in PvP scenarios

• • Fixed compatibility issues with Japanese copies of the game

• • Fixed an issue which caused some enforced safe-zones to persist in pseudo-multiplayer events
  • Fixed an issue which would cause spectating players to only partially complete Starscourge Radahn
  • Invaders can now use the compass to find all players, not just the host
  • Improved mod stability when handling spirit ashes
  • Players can now share waypoints on the map with each other
  • Added new INI option: "skip_splash_screens" that allows you to skip the introductory logos on game start
  • Added new INI option: "default_boot_master_volume" that allows you to preserve your hearing on game start

• • Compatibility with game version 1.13

• • Fixed a bug which caused invaders player instances to persist for too long after failing their mission
  • Fixed a bug which could allow matchmaking between players using overhaul mods
  • Fixed certain DLC-specific actions in multiplayer- Fixed certain DLC-specific actions in multiplayer
  • Fixed a bug which caused a DLC NPC storyline pseudo-multiplayer event to have no completion condition
  • Fixed a bug which made it impossible to transport to Dragonlord Placidusax as a guest
  • Increased invader cooldown time (the grace period in which hosts cannot be invaded by another player)
  • Improved invader spawn positions
  • Modified the starting animation for invaders
  • Added invader PK droptables

• • Fixed a bug which caused some interactions (such as waterfall coffins) to be disabled in multiplayer
  • Fixed a bug that allowed host players to send home invaders
  • Fixed a bug that caused bonfire warp / level up names to fail to be retrieved
  • Fixed an event state bug which caused various NPC pseudo-multiplayer events to have no completion condition
  • Fixed an event state bug which caused NPC pseudo-multiplayer invasions to be impossible when playing alone
  • Fixed an oversight which displayed a player's steam name instead of in-game name on death
  • Reworked invasion spawn positions
  • Enabled overworld invasions

• • Fixed a bug that caused invading players to not display any notification to others that they have arrived
  • Fixed a bug that caused the teleporters in the Ainsel River boss fight to not work in multiplayer
  • Fixed a bug that caused the teleporters in the Nokron, Eternal City boss fight to not work in multiplayer
  • Fixed a serious bug which could cause significant world event disruption
  • Warping to a bonfire will now inform other players in the session which bonfire you have warped to
  • When invading as an evil spirit, you now get information regarding how many opponents are in the world
  • Added new player display option: 5 'Display ping AND soul level'

• • Fixed some locked and special evergaols (e.g. Golden Lineage Evergaol, Ordina Liturgical Town)
  • Fixed grand lift of Rold
  • Fixed dectus lift
  • Fixed horse flickering for guest players
  • Fixed guest players horse remaining dead after respawning (requiring a re-connect)
  • Fixed a few outlier fog walls in multiplayer (e.g. Academy Crystal Cave)
  • Fixed a bug with the mission for assisting Millicent missing it's ending condition
  • Fixed a bug with the mission for fighting a key DLC invasion boss missing it's ending condition ( note -- the boss itself is still extremely buggy but now possible )

• • Fixed a bug that caused some interactable objects (such as elevators, fire pillars, etc.) to reset to their default position
  • Fixed infinite loading screen when loading into Roundtable Hold

• • Fixed a bug that caused human-type bosses to give an incorrect amount of souls on death
  • Fixed a crash involving invading NPCs
  • Disabled Ensha's Round Table Hold event whilst bug fixes are in progress
  • Bundled crashpad launcher required for creating crashdumps in the event of crashes

• • Removed spirit ash nerf
  • Fixed a bug that could cause the game to crash if dismounting a horse on a moving object
  • Fixed a bug that could cause players who skipped the Radahn cutscene to perpetually fall

• • Fixed a stonesword key evegaol in peninsula
  • Disabled invasions during active boss fights
  • Fixed a bug that could cause invaders to rarely progress their world whilst invading a session
  • Clarified some options in the ini
  • Shops stocks are now local to your save file, and aren't session shared
  • Removed black screens when loading in enemies after resting at a bonfire
  • Bonfire lighting range increased to global
  • Added bonfire light notification string
  • Rewrote CSLockTgtMan which should hopefully fix the lockon breaking on horseback
  • You can drop sorceries, incantations, and upgrade materials
  • Reworked invasion matchmaking thresholds

• • Compatibility update for game version 1.09
  • You can no longer waste runes with the rune decanter if you already have a rune arc active
  • Fixed a bug which caused certain dialogue messages to be inappropriately networked
  • Fixed some bugs with the mod's translation index; Updated translations

• • Implemented translations and language file customisation (partially in some cases)
  • Reworked the spectating system to be more reliable
  • Shops are now instanced, meaning that each player has their own stock of items.
  • Added "Rune Decanter" item which allows players to exchange runes for a rune arc
  • Modified the way in which world data is synchronised to clients from the host
  • The world map will now resemble the state of the host when joining as a client
  • Fixed a bug which would cause some locally progressed flags to be read whilst within another world
  • Fixed a bug which would cause world synchronisation "catch-up" when joining a more advanced player
  • Fixed a bug which would cause some guest player flags to be inappropriately synchronised to the host world
  • Fixed a bug which could cause the horse to be unresponsive when calling it after dying as a client
  • Fixed a bug which could cause FeSpecialText events (e.g. "Enemy Felled") to repeat themselves as a guest player
  • The last bonfire that the host has rested at should now be synchronised to connecting clients
  • Increased the network refresh rate of characters and players which should allow for smoother movement of fast objects
  • The mod launcher will no longer launch the game if the dll is corrupted or missing
  • Fixed a bug with the mod launcher which prevented function if the file path was > 250 characters long
  • Temporarily disabled NPC-world invasions

• • Fixed an issue introduced in the previous version which would cause some special visual effects to crash the game.

• • Fixed a bug with vote warping which could cause votes to be erroneously discarded
  • Fixed a bug which could cause enemy target references to be deleted whilst on horseback, making them non-targetable
  • Fixed a minor bug with the spectator camera, which would use a player's health state instead of alive state to choose to spectate them
  • Added better user information messages when connection problems arise
  • Modified the irregular FPS warning
  • Crashpad integration

• • Fixed a bug which could cause people to become stuck in serial loading screens when travelling to Roundtable Hold for the first time
  • Fixed a bug which would cause you get stuck when accepting an invitation to the Roundtable Hold for the first time
  • Fixed a bug which would cause spectating players to leave behind a solid obstacle where they had died
  • You no longer accumulate rot essence when wiping out to a boss
  • The spectator camera will now swap between players based on death states instead of absolute HP
  • Grace vote warping has been made more straightforward, and incorrect votes are discarded
  • Stakes of Marika now function as normal in co-op
  • Enemy AI should now be more consistent, as player death states are updated faster

• • Fixed a bug that caused the compass to not show other players
  • Fixed a bug which caused evergaol bosses to have no multiplayer scaling
  • Fixed a bug which caused enemy scaling for 4 players to be the same as for 5 players
  • Fixed a bug which caused hostile spirit ashes in PvP modes to attack the summoner
  • Fixed a bug which would cause dead spirit ashes to be respawned if a player loaded in as a spirit ash was dying
  • Fixed an issue which caused long load times to allow the mod to load vanilla .sl2 files
  • "Team A" is now the blue team, and "Team B" is now the red team. PvP teams mode now has different player colours
  • You can now choose your own custom save extension (default is .co2)
  • Removed the PvP-oriented health reduction for spirit ashes
  • Added compatibility with mods that adjust multiplayer scaling values beyond 3 friendly players

• • Fixed a bug that wouldn't allow players to join from non-MP enabled areas
  • Fixed a memory problem which caused some players to be unable to join multiplayer sessions
  • Fixed a bug that caused transporter chests to not function correctly
  • Fixed a vanilla bug which caused the compass to not display other friendly players

• • Compatibility update for game version 1.08
  • Rewrote, fixed, and expanded networking backend
  • Added 6 players coop mode
  • Expanded enemy scaling for the increased player count
  • Spirit ashes are now available to use by all players, once per grace rest
  • Fixed a bug which would cause wanderers to crash when using the Judicator's Rulebook in teams mode

• • Transporter chests will now close properly after entrapping players
  • Fixed a bug that caused some enemies to lose aggression after killing a player
  • Fixed a crash caused by a race condition when starting a warp vote as the host
  • Fixed some broken text in the mod
  • Slightly modified some of the mod item use visual effects
  • Optimisations to the start-up code should mean that the mod starts slightly faster

• • Fixed a bug that caused bosses found behind fog walls to not scale correctly

• • Fixed a bug which caused significant issues displaying the correct position of the horse on other clients
  • Major code optimisations

• • Fixed a bug that caused an issue with substantial enemy scaling

• • Compatibility update for game version 1.07
  • Fixed an issue which could make heavily modded games have difficulty establishing a connection to each other

• • Fixed a bug that disabled flask potency upgrades in co-op
  • Fixed a bug that caused significant enemy synchronisation problems

• • Updated to be compatible with game version 1.06
  • Rot essence now has double the debuff potency per stack. Emaciation no longer reduces attributes. The maximum stacks of any rot is now 5 (from 10)
  • The "find target grace site" feature has been improved to work correctly with different map layers
  • Fixed a bug that would occasionally cause player's sacred tear progress on their flasks to reset
  • Fixed a bug that would occasionally cause a problem displaying evergaol vote messages

• • Fixed a bug that caused hosts to get diminished runes from substantial enemies
  • Fixed a bug that would cause irregular horse positioning if a player stands on dynamic world geometry while mounted
  • Fixed a bug that caused some dynamic geometry to become desynced after dying as a guest
  • Fixed a bug that would crash players if a waypoint was deleted before they had opened the map for the first time
  • Fixed a bug that would crash players rarely as another player was joining the party for the first time
  • The mod will now look for the ini file wherever the dll is located, instead of a specific folder
  • Added some configurable player HUD options for the 'Host of Fingers' title: Off, default, view ping
  • During a warp vote, if you press LB (Z) whilst in the map, the map cursor will automatically move to the site of grace being voted on
  • You can now drop sorceries, incantations, and weapon upgrade materials to other members of your party
  • Slightly decreased poise resistance in 3 and 4 party enemy scaling for substantial enemies
  • Chariots will now target the host exclusively to prevent conflicting AI goals
  • Updated the functionality of the Judicator's Rulebook to provide a selection of options rather than cycling through game rules
  • Added team fight options to the Judicator's Rulebook. Guest players can now use the book to choose teams if team fight mode is active
  • If an update is available the message should now be more clear
  • Rewrote some dialogue and improved some user messages
  • Code optimisation

• • Fixed a bug that would occasionally display "?NpcName? has been slain" when killing a substantial enemy for parties greater than 2
  • Fixed a bug that would occasionally spawn new guest players beneath geometry if the host is moving quickly through the world as they are joining
  • Fixed a bug that would occasionally cause the map to fail to load for guest players
  • Fixed a bug that would occasionally prevent guest players from respawning their horse when falling from a significant height
  • Fixed a bug that would cause the game to crash if a waypoint is removed after already being deleted
  • Fixed a bug that would cause substantial enemies to re-adjust their scaling parameters if a player or friendly NPC disconnected during the fight
  • Fixed a bug that would cause Melina to approach guest players inappropriately
  • Added measures to ensure critical networking packets do not get lost with unstable connections
  • Added a new event when a party dies to a boss
  • Network stability improvements

• • Corrected an issue which allowed the game to un-do some of the mod's patches

• • Compatibility with game version 1.05

• • Fixed a major bug which caused "Rot Essence" to not be correctly removed from player's inventories
  • Fixed a major bug which allowed guest players to upgrade their flask past +12, resetting their flask level
  • You no longer have to be in a session to remove rot essence at a site of grace

• • Fixed a bug that caused evergaols to be unusable in single player
  • Fixed a bug that would break spectator mode if you activated the fall death camera
  • Fixed an issue which caused enemies to attack players who are spectating

• • Fixed a bug that allowed the host to spam evergaol begin votes
  • Fixed a bug that caused players to get locked in an animation when activating evergaols
  • Fixed a bug that caused sites of grace to be labelled as "Table of Lost Grace" and have their action button prompts moved
  • Fixed a bug that caused players to be stuck in the Round Table Hold if they had already killed Ersha
  • Fixed a bug that caused players to get duplicate event items if they disconnected during a loading screen
  • Fixed a bug that would occasionally cause the mod's auxiliary connection to time out, meaning that additional functionality of the mod stopped working
  • Fixed a bug with the "neutral" game rule which caused enemy aggression to be affected
  • Fixed a bug with the "neutral" game rule which made it impossible to apply party buffs/heals to other players
  • The map will now close automatically once you cast a vote to warp
  • Evergaols are now named appropriately when someone votes to begin one
  • The mod will now check for updates on boot, and alert you if there is one available
  • Reworked Elden Ring's p2p system

• • Fixed a bug which caused some event-linked items (e.g. activated great runes) to not be given to guest players when consumed by another player
  • Fixed a bug which caused significant enemy synchronisation issues
  • Fixed a bug which would prevent guest players from respawning their horse
  • Fixed a bug that would occasionally let players respawn even when a boss health bar is present
  • Fixed a lingering bug which caused connection issues when joining from certain areas
  • Fixed a graphical bug which caused NPC invader health bars to duplicate
  • Added friendly fire mode. This means that you can injure other players, but they are not hostile
  • Added a HUD icon to indicate when you're actively hosting a session, and when PvP mode is enabled
  • Added visual indicators to accompany the "Seperating Mist" item. To make it clear that it's working

• • Fixed an issue which prevented people from joining as co-operators from non-MP enabled areas
  • Fixed a crash caused by hovering over waypoints being deleted by another player
  • Adjusted enemy scaling, and added enemy posture scaling
  • If your character does not have the mods items, they are automatically given to you
  • Fixed some typos in the item descriptions

Please read the full mod description carefully before use. The mod is currently in a beta state, so you are very likely to experience bugs. If you do, please report them to me in as much detail as possible and I'll work to fix them for future versions.

Elden Ring is a huge game, and testing every possible route/combination a party might take through the game is impossible. The purpose of the beta is to pool resources, get as much information as possible, and fix bugs as they arise. Updates to address bugs will be frequent.

Since the DLC update, the mod has been re-written and therefore requires extended beta testing. Please be understanding.

If you are looking for a bug free experience, you won't find it in this version.

About

If you're enjoying this mod, and want to support me, you can buy me a coffee here. 

The mod has a discord! (I am not affiliated with the discord)

**

Seamless co-operative play

**
Simply put, the mod allows you to play with friends throughout the entirety of the game with no restrictions. With this, it's theoretically possible to play the game from the tutorial up to the final boss completely in one co-op session.

• If a player dies, they will respawn in the same world at the last bonfire they rested at. The session will not be terminated.
• Defeating enemy bosses and clearing areas no longer sends co-operators home.
• All fog walls/barriers that usually restrict the multiplayer zone (along with their respective teleports) are gone.
• All players can use torrent (assuming they have the whistle) in a session together.
• All map waypoints will synchronise, allowing you to navigate the world in a group easier.
• All NPC dialogue and talk events will be synchronised
• When one player rests at a Site of Grace, the world state will reset for all players
• Game progression events completed in online play will also progress the game in your own world.
• You can play with 5 other players in the open world.
• An overhaul to Elden Ring's Peer-to-Peer connection system, using Steam's newer networking API

Players are free to explore the entire game map (overworld, underground, legacy dungeons, etc.) together, and may split up if they wish

Quality of life improvements

Along with core function of this mod, there are a number of quality of life improvements that you might like:

• As the mod runs the game with Easy Anti-Cheat disabled. You are free to use other mods (e.g. game overhauls) with your friends, provided that everyone in the party has them installed. Please be respectful to your fellow co-operators, and refrain from using mods if they are not welcome.
• Frequent disconnections resulting in packet loss and bugs with Elden Ring's implementation of Easy Anti-Cheat are no longer an issue.
• A streamlined connection system means that co-operators can join the host from anywhere in the world. So even if you do disconnect, you can very quickly re-join and continue where you left off.

Balancing

This mod undoubtedly makes the game much easier. To try and offset this and preserve the game's challenge, mechanics have been introduced in addition to the base game's enemy health pool increases as you would normally get with increasing phantoms:

• You may customise scaling to your preference
• If one player sits at a bonfire while others are in boss rooms, those players will be removed from the boss rooms.
• Dying during a boss battle or invasion will put your character into limbo, spectating other players until either everyone in the party has been defeated, or a player rests at a site of grace.
• If enabled, dying in a cooperative session will afflict your player with rot. Rot is a stackable debuff which will increase with subsequent deaths. You can only remove rot by sitting at a Site of Grace. There are 5 different types of rot, which will be picked at random when a player dies. This has been implemented specifically to avoid one player dying over and over without any downsides, while another player stays alive to keep the enemies from respawning.

Invasions

If enabled in the ini file (allow_invaders = 1) then other players will be able to join your session as an evil spirit and attempt to kill you and your party.

During an active invasion, you cannot warp or use sites of grace to rest. Until you defeat the invader and banish them back to their own world.

If you would like to invade a player, then use the hairpin item in-game, and you will join a random player's session (within your matchmaking range) and be able to engage in PvP.

Can this ban me?

No. The mod prevents you from connecting the FromSoftware's matchmaking servers, and it uses save files different to the non-modded game. Easy Anti-Cheat is also not active when using this mod. There's no way to get banned using this mod unless you modify it with the intent of connecting to vanilla players.

As this mod introduces new items not found in the base game, it uses a different save file to the normal '.sl2' extension. This means that you cannot access your Seamless Coop save files in the base game, and vice versa. Do not revert mod save files back to vanilla save files, as you will likely get banned.

Installation

**You do not need any other mods to use seamless co-op. The NexusMods 'Requirements' tab is mods that require Seamless Coop, not the other way around.
**Compatibility with other mods has not been tested. You may use other mods, so long as they do not interfere with the multiplayer aspect of the game, or edit any of the items the mod uses to function.

• Download the mod from the 'Download' tab or the GitHub mirror

• Extract the package you downloaded, and move the following files to your Elden Ring folder (usually in "C:\Program Files (x86)\Steam\steamapps\common\ELDENRING\Game")
• Edit "ersc_settings.ini" to your chosen co-op password
• Launch the mod using "ersc_launcher.exe"

You don't really have to uninstall the mod. You can use the launcher when you want to play it, otherwise just run the game normally. If you'd like to remove it fully, simply delete the files you downloaded from here.Within the SeamlessCoop folder should look like this:

Use

You must be signed into Steam, and not in be offline mode to use the mod.

You will get the items required to play seamless co-op when you rest at a site of grace.

You and your party members must be running the same version of the mod and the game to play with each other.

I strongly recommend a secure session password, if a player knows your co-op session password then they can join immediately. The mod use's Steam's matchmaking interface alone in order to engage in multiplayer with others. Note that you must set a password to host and join sessions:

One player must host, and other players must join. You must have the same password as the person(s) you'd like to play with (found in the "ersc_settings.ini" file).The host must use the "Tiny Great Pot" item to create a session. At that point, the other players can join using the "Effigy of Meleina". You should spawn in at a point nearby the host. Any player can leave at any time using the "Separating Mist" - If the host uses this item, the session will be disbanded and all players will disconnect.The host can use the "Judicator's Rulebook" at any point to toggle friendly fire and PvP game modes.When you want to stop playing. Every player (including the host) must use the separating mist in order to close the party.

Troubleshooting:

**If you're crashing:
**

- Make sure you've verified game files with Steam- Make sure you've tried running the game with ray tracing turned off- Try running seamless co-op alone without any mods and check to see if the crashing continues- Try running Elden Ring vanilla to see if you're still crashing- Try updating graphics drivers

**"seamlesscoop\locale not found which has no fallback"
**

- You need the locale folder in your Game/SeamlessCoop directory. Check the mod description page for installation instructions and try again.

**Unfixable:
**

- "Failed, Steam timed out". This is nothing to do with the mod - there is just no connection to Steam. Remember that the servers go down for maintenance every Tuesday.- The mod can't fix poor internet connectionsI hope this helps. Please understand that the volume of people posting make it impossible to keep up, so I apologise if I cannot answer your question directly.

FAQ

Q) Does this worked for cracked/pirated games?
A) No, I'm also not going to be supporting these versions so please don't make bug reports about itQ) Isn't this just easy mode?
A) Not necessarily, while co-op play does make the game objectively easier, it's also a completely different way to play the game. There are plenty of "easy mode" mods out that that just give you high health/damage. This mod will be easier but is made in mind of those who want to play the game the whole way through with friends. It has been designed with fun in mind as opposed to reducing the challenge.

Q) Can I modify or redistribute this mod?

A) No, sorry. Please do not modify, repackage, or redistribute this mod anywhere without my permission.

Q) Can I use my save game from the base game?

A) You can, although it would require more work. As mentioned the mod uses separate save files by using the ".co2" file extension instead of ".sl2." Make a copy of your .sl2 file, then change the new copy to .co2. Once ingame, you will receive the mod items automatically. Do not move your save from the mod to the base game, as that may get you banned.

Q) Will updating the mod affect my current playthrough with it?

A) No

Q) Will you make a similar mod for Dark Souls?

A) No

Q) Can you get Steam achievements while using this mod?

A) Yes

Q) I have a question not answered here.

A) If you need more information, or wish to report a bug, have a suggestion etc. please make a post about it, or send me a direct message.

Special thanks

Alpha testers: joby, inuNorii, Emilia, Remyzk, Amirah, Gáté, IshLexi, Hobotam, ibby, HEKTIK, Purpurea, Adopt a Cat, Jouta Kujo, AlpacaSpecial thanks to Tremwil for his advice, prolonged assistance and codeThanks to Oroboro for help with PvP matchmaking tiers.All the beta testers who played the mod so far, and improved it both directly and indirectly through bug reports, suggestions, and building a community around it. And in particular, members who have provided assistance testing it beyond regular play:

Xiao, Lockheed Martin F-22 Raptor, MegaMaverickX7, CardboardBoxGod, Thirah, Etto, Gacsam, MintedTea, Loki2236, therminatorx, Klesck, Solus and Jim Lahey