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September 22, 2026

[Release] Dark Souls 2: Seamless Co-op

Hi everyone

This is a post letting you know that the Dark Souls II: Seamless Co-op mod is now live!

Download the mod:

Known issues

The mod is currently in ALPHA. Do not expect a flawless / bug free experience. The intention of mod release now is to collect feedback and bug reports and work towards a better experience. Please find a list of known bugs/issues:

  • Sometimes, dying in a session can cause enemy de-sync to the enemies that have already been alerted

  • 'Velstadt, the Royal Aegis', and 'Sinh, the Slumbering Dragon' will occasionally de-sync

  • Object interactions (i.e. doors opened, items picked up) may not update in phantom's own worlds when completed in a host session (Phantom only)

  • Item pickups may be duplicated / lost when reloading in the host world (Phantom only)

  • Occasionally, a host world may become un-joinable. Fixed by closing and re-opening the session

  • Mirror Knight invaders will occasionally fail to connect

Most of these issues are not game-breaking.

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 are gone.

  • All NPC dialogue and talk events will be synchronised

  • When one player rests at a bonfire 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 Dark Souls II's peer-to-peer connection system, using Steam's newer networking API

Mod items

Currently there are 12 items unique to the mod -- Please note that the icons in this post are currently a WIP and not final:

  • Pharros' Heliograph - Used to open (host) a seamless online session

  • Fragment of Brilliance - Used to join a seamless session as a friendly player

  • Fragment of Malevolance - Used to invade a seamless session as a hostile player

  • Obscuring Stone - Used to disconnect from a seamless session

  • Petrified Fingers - Used by the host to increase invader count and frequency

  • Hallucinogenic Elixir - Used by the host to change the world's rules

  • Cursed Soul Fragment - Represents world affliction build-up

  • Transient Curse - Represents proof of a disaster felled

  • Mirror Talisman - Used to join the Mirror Knight covenant and invade during the boss fight with the Looking Glass Knight

  • Fragment of Sin - Used to join the Blue Sentinels covenant and invade sinners [ WIP / NON-FUNCTIONAL]

  • Extravagant Bell - Used to join the Bell Keepers covenant and invade trespassers to the Belfy areas [ WIP / NON-FUNCTIONAL]

  • Severed Tail - Used to join the Rat King covenant and invade trespassers to the Doors of Pharros [ WIP / NON-FUNCTIONAL]

  • Darkcaller Bell - Used to join the Pilgrims of Dark covenant and invade trespassers to the Abyss [ WIP / NON-FUNCTIONAL]

  • Ancient Dragon Ring - Used to join the Dragon Remnants covenant and invade trespassers to the Ancient Dragon [ WIP / NON-FUNCTIONAL]

Quality of Life Improvement

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

  • 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.

  • Allowing the user to set the volume of the title menu

  • Fixing the "Disable double clicking" option not working correctly for keyboard and mouse players

  • Re-addition of the server timed-exclusive cosmetic items from the original Dark Souls II

  • Conversion of the controller deadzone area to a radial deadzone

  • Allowing the user to skip the ending credits once the game is complete (normally unskippable in NG, lasts about 9 minutes)

  • Option for borderless fullscreen mode

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

  • Players cannot sit at a bonfire whilst another player is fighting a boss

  • 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 bonfire.

  • (Optional) Dying in a session will afflict your character with a cursed soul fragment, increasing the difficulty of enemies. Dying too many times without resetting at a bonfire will cause disaster to occur in the world.

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 bonfires 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 fragment of malevolence item in-game and you will join a random player's session (within your matchmaking range) and be able to engage in PvP.

Comments (112)

w
wheremybike · October 6, 2026

how are you meant to get the mirror talisman for mirror knight invasions? it didn't get added to my inventory at the bonfire and it didn't drop from the mirror knight

F
FantasyFinal12fan · October 4, 2026

Quick question... How does this mod react with the Champion's Covenant?

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Spess Enthusiast · September 30, 2026

I am so hype, I literally just got all of my friends on for this!

I
Illia Samarin · September 28, 2026

Could you please add support for Windows ARM64 injection? Im using snapdragon x, but the game just runs without the mod.

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Liv Atomic · September 28, 2026

hi Yui, any chance we could get an option where everyone alive has to agree before resting at a bonfire? kinda like minecraft's sleep system. Would be sick for co-op!

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TheGamingFan · September 28, 2026

Want to help test it, but my cousin's pc is busted :(

M
MentalAffection · September 28, 2026

ik here's a lot of comments but i just want to recommend some people how to start playing the mod,for some reason with random chance i guess(happened to me and my friend once) you won't be able to get an estus flask and will be forced to use cheat engine or create another save,also there's a bug(or maybe not) that can restore all the items i picked up back in their places,i think it's somehow connected with bonfires but im not really sure. that's all i found

J
Jeikavick · September 27, 2026

te amo

A
Ali Raza · September 27, 2026

just to help where can i let you know the glitch?

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Bensen · September 26, 2026

Am I doing something wrong? My fps drops to like 10 but when I load up the actual game its fine

Y
Yui · September 26, 2026

Bug in current version with some cpus

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Andrea Nin · September 26, 2026

is it possible to reduce the new coop UI?

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TSOTK · September 26, 2026

The dark souls game series has always been my favorite, I played each part for a couple of hundred hours alone and was always sad that it was only for one player. Thanks to you and your efforts, I was able to go through every part with a bunch of my friends (right now we're sitting at 2). Thank you very much for all your contribution.

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ECHOHO · September 26, 2026

I think there’s a problem with the controller settings in Seamless Co-op

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Evil Cake · September 26, 2026

thx again

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Blaiz · September 26, 2026

Im very thankful for this mod honestly. im however having an issue where ive downloaded the mod and bring it into my ds2 game file, but everytime i try and start up the seamless coop it keeps saying "Please enter a session password in your settings file" even though i have a password. could i get some help on that?

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jenzfc · September 26, 2026

Any chance everyone keeps harassed by the Pursuer? Like everywhere? Even if you’ve killed him. And even if you haven’t fought him at all.

D
Dego Lima · September 25, 2026

My controller just don't work lol.

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Strange Sailor · September 25, 2026

Nunca tive tanta ansiedade pelo lançamento de algo desde que anunciaram Shovel Knight DX. Agora posso desfrutar da melhor experiência cooperativa online no melhor jogo da série, presenciei alguns bugs, mas nada que estrague a experiência. Fico muito grato pelo seu esforço e estudos da engine para nós dar esse presentão.

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Guus Baeten · September 25, 2026

Do you still have a Ko-fi? I would like to show my appreciation but can't do Patreon

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XxxzeroxxX · September 25, 2026

o brasil te ama, finalmente ! vou poder jogar meu souls like favorito em coop de verdade simbora!!!! vlw pelo trabalho \o/

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noxthefool · September 25, 2026

been playing with the mod for a bit and found two, not sure if they're bugs, but definitely oddities. one thing, when a cooperator dies, they don't leave a bloodstain that can be picked up. instead it seems the bloodstain appears in their own world at the place where they first joined another session. and the other thing is that the agape ring doesn't seem to work. don't know if intentional but i still get souls regularly while wearing the ring it would be really nice if these two things could be adressed as they pretty heavily impact the flow of the gameplay

h
hodorigork · September 25, 2026

Thank you, the mod is perfect.

O
Orangeem · September 25, 2026

sooo armored core 6? 😏

A
AstralSeraph · September 24, 2026

THAS WHAT IM TALKING ABOUT! THATS WHY HES THE GOAT

M
Moisty · September 24, 2026

Absolute 🐐 THANK YOU! 🙏🏻

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inuzziii · September 24, 2026

After I died when buying ladders from ladder smith gliggin the ladders disappeared and not in his shop nomore to purchase

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Ashè Fìnlayson · September 24, 2026

Do you know what the matchmaking range for pvp is, getting invaded by people with gear that seams impossible (maxed out weapons + dlc 3 stuff) to get at sl 50 with less than 100k soul memory

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BMDB Chris · September 24, 2026

There was a severe bug when I and my friends had different progress with maps. I finished No-Man's Wharf‌ at first, my friend did enter that map yet. And then he joined my world and he cannot get into the boss ship, when he want to walk onto the ship, he will instantly die. And also when we joined his world and re-entered the ship, he still died while he is the lobby host, and the boss is in-activated

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Bonnie Bovine · September 24, 2026

W colors on the pop up notification in the mod. Also does anyone know the best way to play this on an ultrawide? i cant seem to choose borderless window and when I select anything for my resolution it just stretches the whole screen to fit lmaoo

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Zachary Pfendner · September 23, 2026

You're the best! Worth the wait, and a nice surprise. I appreciate you 🦆

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Marcus Thieme · September 23, 2026

Cheers man! Hope you‘re looking forward to the finetuning and can be proud of progress so far!

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Jesse McCard Jr · September 23, 2026

Hey YUI,

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The Gooseter · September 23, 2026

When I try to download it, my computer thinks it's a virus

J
Joshua Olivera · September 23, 2026

So maughlin the armor respawned while I was a host and out of the blue his tombstone showed up we didn’t kill him though not sure if he fell through the stage but it happened for sure

Y
Yi Chou · September 23, 2026

Chaser still appears even though all players in the session don't have any Cursed Soul Fragment. We tried disabling the death_debuffs but still a chaser appears. (the enemies don't glow red either) We ended up deleting the save file for now, haven't tried the new file yet.

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GhostwithSkin · September 23, 2026

Generational Mod, been having a blast with it, stay blessed 🙏🏽 one thing we noticed was that Phantoms are unable to Deal DMG to Host NPC Like Pate, while the Host can Attack normaly. As a phantoms you can be attacked by i.e. Pate but wont be able to do any DMG back. (might also be some setting we fked up but not sure what would cause that) Some people here also prolly shouldnt be playing this Game at all as they seem to Lack the eye and brainfunction to read or spend morgen than 3 Seconds on any post

t
t · September 23, 2026

dont think steam achievements work for whoever joins unfortunately

T
ThatGuyCole · September 23, 2026

Hello, Been having a blast with a friend playing it today after having issues downloading it like others have mentioned I think. But as I don't have a github account figured i'd mention it here. 3 bugs we've come across so far. first being there is multiple emerald heralds in Majula but this doesn't seem to effect anything negatively so it seems fine and minor at worst. but if you're summoned into someone elses world and go to the birds to trade stones the game crashed/force closed itself once I left a stone at the nest (it didn't actually drop it so no item deletion going on, just something I guess people should be aware of) Lastly we killed Persuer before his arena and somehow got 2 souls (boss soul item and the ring he drops) from him each, but doing the dragon rider cheese worked normally and only gave us the normal amount of souls and items so i'm unsure of the cause, will mention if run into anything else but I am unsure how much of an issue this one is.

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RILINDAR · September 23, 2026

Идентично с изумрудным вестником и камнем для птицы

J
Joshua Olivera · September 23, 2026

Maughlin the armor merchant went missing for no reason whatsoever playing with a buddy The mod is awesome though!!!

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TheShadedOni · September 23, 2026

It launches my command prompt and says 'Failed to find "SeamlessCoop//ds2sc..dll" (Error=2) Press any key to continue...' And when I press any key It just closes (Edit: for some reason, the file Is leading to a website, idk why so I'm gonna edit it to be slightly different but you'll get the point) Edit 2: I realized it kind of just deletes itself after I run it?? Very weird...

C
Cameron Coshenet · September 23, 2026

Unfortunately cannot connect to anybody no matter what amount of troubleshooting I follow

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Chitlins222 · September 23, 2026

Thanks for the mod. I am having issues adding it as a non steam game tho. It defaults to just regular sotfs for some reason when I run it from steam

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ThievingWolf · September 23, 2026

My antivirus says the download has a trojan, explanation plz?

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Big Meaty · September 22, 2026

big thanks for this and all the seamless co ops

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inuzziii · September 22, 2026

It was working then all sudden said can’t find seamless coop but found out it’s because it quarantines the file thinking it’s a Trojan so if anyone has that problem u just allow it and it works!

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Zahashi · September 22, 2026

Hey whats up with the weapons down at the majula house chest?

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RedOne01 · September 22, 2026

Is there any way to add the ability to get the summoning items without resting at a bonfire? Would like to attempt a no death no bonfire with da boys but that's a bit of a hurdle. Looks great so far btw! :D

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Ryan Indiefest · September 22, 2026

LESGOOOOOOOOOOOOOO

R
Rhian Shepherd · September 22, 2026

So the Nexus link is bringing up a virus detection. Seems to have a trojan attached to it.

F
FiddleGibbons · September 22, 2026

HUGE! Phenomenal job!

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XenonDarkSoul · September 22, 2026

Now imagine if bloodborne was on pc

j
joeybowitz · September 22, 2026

Why is windows and chrome calling it a virus?

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Niklas Beck · September 22, 2026

Thanks for this free release, I guess we could all hand some money over to ya for this

A
Andy · September 22, 2026

THANK YOU SO MUCH. Is it possible to do local split screen co op with this?

r
razemponadkilo · September 22, 2026

best mod ever respect Yui

L
Luzak z bedzina · September 22, 2026

Hogglefart toxic player very nice mod respect😎

r
razemponadkilo · September 22, 2026

hogglefart stinky zgerypala

T
The Spotty Bandit · September 22, 2026

ITS HEREEEEE ily yui

Z
Zachary Neely · September 22, 2026

windows is flagging the file as a virus for some reason any ideas on how to get around that?

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Chitlins222 · September 22, 2026

The GitHub seems to be empty, can you please add it there?

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Spartan Fred · September 22, 2026

Been waiting so long for this moment! Question though, are you worried about your paid supporters dropping the support with the release of the mod?

D
Dryzen · September 22, 2026

i love seeing the emerald herald cloning herself in Majula. Please don't patch that out ever

D
Dryzen · September 22, 2026

and kiitos

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Garion Pankievich · September 22, 2026

Thank you so much! Now go relax, you deserve a break ❤️

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Cristian Pavón · September 22, 2026

Yuri, you are simply too good at your job, your mods are incredible and I really admire what you do for us. I hope the best goes for you in your personal life and you manage to successfully complete all your personal projects, I wish you the best ♥

b
bruckner53 · September 22, 2026

Thank you!!!

d
danboss · September 22, 2026

Thank you Yui, Dark souls 2 has been my favourite game for years, but i have always been burdened by one issue. I can’t coop it with my friends like the other games. Today, you have bestowed upon me a simple and high quality solution and i am eternally grateful. Once again, thank you Yui.

A
Aatu Ahola · September 22, 2026

olet goat

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Balogun-Kkwazzawazzakkwaquikkwalaquaza Zzabolazza · September 22, 2026

Ayooooo🤍🤍🤍🤍 quick question tho, I subbed a short time ago and didn’t find this info…this is for Dark Souls 2 or Dark Souls 2 Scholar Of The First Sin??

P
Piggy McPorkchop · September 22, 2026

#creamteam

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Zzsark Stormbeard · September 22, 2026

Thanks a lot for your work ❤️

M
Mufufu · September 22, 2026

the day has come, thank you for carrying the souls co op community Yui

s
shoebill · September 22, 2026

a tear went down my leg

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Sepes Owlcat · September 22, 2026

Thank you so much! This is a waited mod🙏

D
DSN · September 22, 2026

YUUUIIIIIII MY GOOOOAAAAATTT

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Trollmoney · September 22, 2026

Thank you man

P
Plague of Gripes · September 22, 2026

Looks like the Github is empty, for now. Also a bit surprised that there's no additional 'poise' for enemies per player, by default. Is that due to how poise works in 2, or just a precaution to a bug, etc? Fine work as always, Yui. Especially with the new engine.

C
Celaline · September 22, 2026

legendary

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The Axe Warrior · September 22, 2026

At last. A full Dark Souls Trilogy seamless co-op play-through is possible!

A
Allram · September 22, 2026

:O cant even. I am so hyped for this.

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Guus Baeten · September 22, 2026

So exited to try it out. Blown away by all the extra stuff you included!

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Fourgees · September 22, 2026

YESSSSSSSSSSS

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FistMeDaddy · September 22, 2026

Huge thank you for all the work you put into this!! Excited to finally try it out with my friends!

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Erizana · September 22, 2026

Let's go ooo! You are the freaking goat thank you so much for your hardwork 🥳🥳🥳

K
KRIS_ _1231 · September 22, 2026

les gooo

J
Jhon Doe · September 22, 2026

LETS GOOOOOOO, MUCHAS GRACIAS YUI!!!!! TE QUIERO MUCHOTE!!!! Juro que apenas tenga como apoyarte mediante donación o suscripción lo haré. Muchas gracias, Dios te bendiga :') ♡

C
Ciro Plosker · September 22, 2026

I came

C
Choomkinz · September 22, 2026

I love you

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Qaahnarin · September 22, 2026

Wasn't having a great day, am now having a great day. Praise this blessing from the one who has freed us from the shackles of the spaghetti soul memory

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Garoto Álgido · September 22, 2026

Thanks for The mod, o like you Very much. You are incredible! The mod is only for steam and original ds2?

j
joeybowitz · September 22, 2026

Best souls is back

E
Eric Lilja · September 22, 2026

Thank you so much! This is wonderful time to be a fan of DS2!

J
JuZomBo · September 22, 2026

it seems to be crashing for me on startup.. anyone else?

i
inuzziii · September 22, 2026

Thankkkk youuuu!!!! I appreciate all the hard work you’ve done!!!

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Jake Hardy · September 22, 2026

YUI THE GOAT!!!!! Congrats on the release and all the hard work that’s gone into it so far!!!

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DIZZY fisshurre · September 22, 2026

Cannot get off work sooner lol. Thank you thank you

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Nime · September 22, 2026

Also please do take care of your health Yui!

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Nime · September 22, 2026

Finally. It's been a long journey and it's been rewarding through out, seeing Yui's updates, learning about how the things work and everything as in the progress of making the mod.. Finally today we're here. It's released. Thank you Yui. This means so much to the community.

J
Jürgen Breise · September 22, 2026

Thank you so much!

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Wesley Sweazey · September 22, 2026

Thank you Yui and your team for your work!! 🙏I can’t wait to try my first DS2 run with my buddy!

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El Norder · September 22, 2026

HELL YEAAHHH!!

c
cadent · September 22, 2026

best late birthday gift ever thank you so much for all your work yui

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Kevin Macartney · September 22, 2026

Let’s goooo! Appreciate all the effort that went into this.

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Никита Лещенко · September 22, 2026

Дякую!

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Papa Johns · September 22, 2026

Crying tears of joy

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Logan Wing · September 22, 2026

Congrats on the release! Thank you for your hard work and I hope you’re doing well!

K
Kenny Russell · September 22, 2026

LETS F**KING GOOOOOOOOO

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ToastyPumpkin (Abby) · September 22, 2026

Thank you so much for all your hardwork!

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zhang jeff · September 22, 2026

Generational mod

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MrHolmer420 · September 22, 2026

AHH NO WAY LESGOOO PROUDA YOU YAYAYAYAY YOU ARE GOATED thank you for all the work :3