Save slot order below when using the save copier. You can just select what class you want to transfer over. 

ELDEN LORD - WRETCH
ELDEN LORD - PRISONER 
ELDEN LORD - HERO 
ELDEN LORD - VAGABOND
ELDEN LORD - SAMURAI
ELDEN LORD - ASTROLOGER
ELDEN LORD - BANDIT
ELDEN LORD - CONFESSEOR 
ELDEN LORD - WARRIOR 
ELDEN LORD - PROPHET 

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All starter classes (not levelled so you can decide how you want to level- character has max runes)
Max runes on character and max runes dropped next to site of grace where you are first able to level up.
Two of each weapon for power stance.
All armour sets. 
All spells, incantations and summons.
All ashes of war.
All talismans
Max upgrade materials for flask and weapons  (no items upgraded so you can start fresh and choose what you want to upgrade)
All bell bearings ready to be given at Round hold once you get there 
Arrows and bolts.
All cookbooks with all recipes unlocked.
Full map unlocked.
All whetstone knifes
All Crystal tears ( you need to still pick up the  flask of wonderous physick at third church or Marika in Limgrave before you can start mixing)  
All Great Runes. 
All gestures.
99 Larval tears for character re- spec.
999 of each crafting item. 

Important notes: Ashes of war duplication has a world flag issue so you can only dupe an ash of war once it's been collected in game. I have added 5 of each ash of war to counter this. If you hand in Blackguard Big Boggards bell and buy the necklace without speaking to him you will hard lock his quest.
All sites of grace will not be added to save because it automatically sets the Erdtree on fire and turns Lyendell into Capital of ash.

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HOW TO INSTALL THE SAVE CORRECTLY:

VIDEO GUIDE: https://youtu.be/u8WUpd3GUEk

ALWAYS make a backup of your save if it's important to you.

1. Download my save and unpack it. 
2. Download Elden Ring Save copier from here https://github.com/BenGrn/EldenRingSaveCopier/releases/tag/v0.0.2-alpha 
3. Open the save copier
4. Click on BROWSE for source file and navigate to my save that you have downloaded and unpacked in step 1 (the copy from dropdown will have 10 save file options for all 10 classes)
5. Click on BROWSE for destination file and you need to locate your current Elden Ring save  C:\Users\[username]\AppData\Roaming\EldenRing (the copy down dropdown will show your existing save and all other slots. To retain your existing save select a different slot)
6. Select copy on the save game copier 
7. Before you start the game you need to delete the .sl2.bak file that is located in the same folder where your save is C:\Users\[username]\AppData\Roaming\EldenRing
8. Start game and  you should be able to load the save.
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CORRUPT DATA ERROR:  If you  get this error then please use this  https://github.com/sabpprook/ERSaveIDEditor this is a steam ID editor that users have been able to fix the error with. When you open it 
there will be a guide to help you use it. I have not had to use it so I can't provide assistance with it. 

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OPTIONAL STEP TO DISABLE EAC: I have uploaded an optional file that can be copy and pasted into the Elden ring game folder. This will disable EAC and allow you to play offline. Please remember to make a backup of the existing file in the game folder prior to replacing it so if you do decide to go back online you can. If you don't then simply verify game files through steam.  And please do not panic when you first run game. If your game was set to start online you will be greeted by a message saying "inappropriate activity detected" This just means EAC is successfully disabled and the game can now only run in offline mode. To remove this message on startup go to settings and change to start game in offline mode.

Disable EAC video guide: https://youtu.be/sCi_-bo1etc

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I used the amazing mod Grand Merchant Xylozi and also Cheat engine to very quickly create this save so thankyou and you should definitely check it out if you want to quickly get access to all items https://www.nexusmods.com/eldenring/mods/129
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Questions:

Can I use this save for seamless co-op mod ? Yes but you need to follow this guide https://www.youtube.com/watch?v=z0CT9LcsPfg

Will I be banned using this save file ? 

As of 15/03/2024 there are no reports of anyone being banned using the save.

Comment's locked due to same questions/issues being asked when the answer is in the description/sticky posts.