New update for Grim Dawn 1.3
Grim Dawn underwent a huge overhaul, so the old 8-player mod is not functional anymore. I have included the original post at the bottom for people to find the old downloads if they still need them.
DISCLAIMER: The edited DLL files are NOT officially supported by Crate Entertainment, and you are using these files AT YOUR OWN RISK! I received special permission to share the DLL files on this forum. Please do not assume that you are automatically entitled to the same privilege. I am not liable for any damages done to your computer, nor your copy of the game. I also cannot guarantee that the game will continue to function properly when playing online.
Thanks to everyone who has helped keep this project alive. I love Grim Dawn, and I love playing it with groups of friends. I hope you guys enjoy this mod to its fullest.
Instructions:
Please note that this mod works in 2 parts:
- Modified Engine.dll - This changes the max player count from 4 to 8.
- 8-Player Scaling Mods - You must activate this as a “Custom Game”, or the game stats will be broken.
To install:
- Download the DLL files needed for your game at the bottom of this post. Inside the zips there are 4 files total, 2 for Steam, and 2 for GOG. Extract the file to your Grim Dawn directory and rename it to “Engine.dll”. The x86 file goes in the root GD directory and the x64 file goes in the x64 directory. Make a backup of Engine.dll BEFORE overwriting it!
- Download the MODS from the bottom of this post. Extract to your root Grim Dawn directory to make them populate the “mods” directory".
- Open Grim Dawn and click on Main Campaign in the bottom right. Select one of the Custom Game mods provided and activate it. See below for the descriptions of each mod.
- If everything worked properly, when you host a multiplayer game, you should have the option to change the max player count to 8. With the mod activated, the game balancing kicks in after the 5th player joins.
Mod Descriptions:
The multiplayer balancing mods work fine in Normal & Veteran with 1-8 players. In Elite, Ultimate, and Ascendant, you must have AT LEAST 5 players in the game for the tables to load correctly. This is why the mods are labelled “5-8p”, because they only work properly in all difficulties with 5-8 players.
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Ninjared_5-8p_HP-only - This will balance the game as though you had 4 players, except all enemy health is increased at a linear rate with each player added. This is for more casual games when you don’t want extra challenge as the player count increases.
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Ninjared_5-8p_scaled - This scales all enemy stats as the player count increases. The more players you have, the more powerful enemies will be. I did my best to scale this at a linear rate based on the increase in difficulty you would normally experience whith 1-4 players.
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“Ninjared_blank” mod - I am no longer providing 3-6 player mods, which were only intended for games where player counts might drop below 5. Instead, I have provided a blank mod where you can host 1-4 player games while staying in the “Custom Game” save space.
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Upcoming: I’m planning on adding scaled+1, scaled+2, and HPx2 mods in the future, for an extra challenge. I am also planning on a mod that keeps the difficulty at 4 players, no matter what the player count, even if you are playing solo.
DOWNLOADS:
Grim-Dawn_8-Players_DLL-Steam(1308).zip (3.3 MB)
Grim-Dawn_8-Players_DLL-GOG(1308).zip (3.3 MB)
Grim-Dawn_8-Players_MODS-V3.0.zip (59.0 KB)
FAQ:
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Q: Will the modified DLL files mess up the vanilla game, or other mods?
A: No, as long as you do not host a multiplayer lobby with more than 4 players, your game should function like normal. However, it is likely that the modified DLL files will be overwritten when the game updates, or if you verify the game files. -
Q: Can I just skip your mods and play with 5+ players with a different mod?
A: Just understand that the player and monster stats will be very screwed up in a lot of ways. You can try it and see for yourself. -
Q: Does this mean I can’t play Crucible with more than 4 players?
A: Just like any other mod, it’s going to have very screwed up stat tables. I cannot release a version of this mod that is combined with Crucible because it is paid DLC. -
Q: Is it possible to make a mod that works in all difficulties with 1-8 players?
A: No, not that I am aware of. The game is hard-coded to categorize the scaling into groups of 4, to accommodate 4 maximum players. My mods work around this by “shifting” the tables to the right. That means that everything to the left is now incorrect. -
Q: Can you make a mod that supports MORE than 8 players?
A: Yes and no. Even though the engine.dll does technically support it, it gets really buggy above 8 or 9 players. I once tried 12 and the game started acting pretty weird. -
Q: Will this mod still work with future game patches?
A: The mods work, but the modified DLL does not. You will need to either mod the DLL yourself, or wait until I release an update. -
Q: Can you release the HEX line edits so I can modify my own DLL files?
A: Yes, I’m planning on it in the near future.
Previous 1.3 releases:
This space is for when updates are made
Original Archived Post:
I finally got it working! Now we can play our favorite ARPG with more people at once! So go buy a few more copies of the game and gift them to some friends! I am very pleased to make this contribution to the Grim Dawn community. I hope you all enjoy!! 
Very special thanks to GlockenGerda for helping me with the HEX editing! Also thank you to Zantai for giving me special permission to share my modified DLL files! I want to make it clear to everyone that I asked permission to share this, and I was instructed to make my disclaimer “absolutely clear”.
DISCLAIMER: The edited engine.dll is NOT officially supported by Crate Entertainment, and you are using these files AT YOUR OWN RISK! Any time you use a modified DLL file, there are risks involved. Always make backups, and be cautious about downloading files that are potentially harmful to your computer.
Do not assume that because I have been granted special permission to share modified game files on this forum, that you are entitled to the same privilege. I am not liable for any damages done to your computer, nor your copy of the game. I also cannot guarantee that the game will continue to function properly when playing online. These files have only been tested on a LAN / VPN.
Instructions:
In order to play the game bug-free with 6-8 players, you will need BOTH the modified DLL files, and the mods.
Modified Engine.dll files: Simply extract these zips into your Grim Dawn directory and overwrite the original files. I have included backups of the original DLLs in the zip archives. There are zips for both the x86 and x64 versions of the game. If you are unsure which version to use, just extract both. These DLLs change the multiplayer drop-down menu to allow up to 8 players, and increase the available party slots to 8.
6/8 Players Difficulty Scaling MODS (v1.1): Simply extract the zip to your Grim Dawn directory. YES, THESE MODS ARE NECESSARY. They are enabled by selecting a custom game in the main menu. Included are FOUR different versions, so please read the descriptions below.
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3-6players_scaled:
Enemy difficulty goes up when adding 5 and 6 players to the game. The rate of increase is meant to match the same rate from 3 to 4 players. I have not fully tested the balancing in this mod, but it’s likely that it will be very difficult! The mod ONLY works properly if you have 3-6 players! -
3-6players_hp-only:
All difficulty scaling stays exactly the same as it is with 4 players, except for enemies’ health, which increases at a linear rate per added player. This mod will be much easier than the “scaled” mod, but I thought players would appreciate having this as an option. The mod ONLY works properly if you have 3-6 players! -
3-6players_plus1:
For a greater challenge, it increases the difficulty as though you had one extra player in your party. The scaling above 4 players uses the same rate as the “scaled” mod, but +1 player. The mod ONLY works properly if you have 3-6 players! -
5-8players_hp-only:
This is the same as the above 6 player version, but the player slots are shifted to accommodate 8 players instead. Enemy health is increased at a linear rate. The mod ONLY works properly if you have AT LEAST 5 players!
If you find anything really outrageous about the scaling in these mods, let me know, and I’ll make some changes. 
Old Updates:
2022-04-02: Added a new mod “Plus1” that increases the difficulty as though you had an extra player in your party. Mod file has been updated to V1.1.
2022-05-21: Updated DLL files for game version 1.1.9.5
2022-06-21: Updated DLL files for game version 1.1.9.6
2022-12-25: Updated DLL files for game version 1.1.9.7
2023-06-10: Updated DLL files for game version 1.1.9.8
2023-09-04: Updated DLL files for gamer version 1.1.9.8 (hotfix)
Old 1.1 Downloads:
Grim-Dawn_8-Players_MODS-V1.1.zip (83.4 KB)
Grim-Dawn_8-Players_x64-DLL(1193).zip (3.6 MB)
Grim-Dawn_8-Players_x86-DLL(1193).zip (3.0 MB)
Grim-Dawn_8-Players_x64-DLL(1195).zip (3.6 MB)
Grim-Dawn_8-Players_x86-DLL(1195).zip (3.0 MB)
Grim-Dawn_8-Players_x64-DLL(1196).zip (3.6 MB)
Grim-Dawn_8-Players_x86-DLL(1196).zip (3.0 MB)
Grim-Dawn_8-Players_x64-DLL(1197).zip (3.6 MB)
Grim-Dawn_8-Players_x86-DLL(1197).zip (3.0 MB)
Grim-Dawn_8-Players_x64-DLL(1198).zip (3.6 MB)
Grim-Dawn_8-Players_x86-DLL(1198).zip (3.0 MB)
Grim-Dawn_8-Players_x64-DLL(1198b).zip (3.6 MB)
Grim-Dawn_8-Players_x86-DLL(1198b).zip (3.0 MB)
.It’s just me and my brothers playing grim dawn.My pc is up to scratch to play with more than 5 players.There’s are not.We also got my one brothers wife to learn how to play arpgs.Her fav isdiablo on switch.She still learning grim dawn because of the different mechanics of the game and the amount of builds you can go.
But I considered the mod to be a success! Future LAN parties will certainly include more Grim Dawn. 
So I went and looked up the numbers, and YES, if you play the plus1 mod with 3 players, it will have the exact same difficulty settings as playing with 4 players normally. In addition, if you are playing with exactly 3 or 4 players, you actually do not need to use the modified DLL files. It did not occur to me that the plus1 mod is useful just by itself, but that makes sense! 