BinderTool "LqChrEbl.bdt" should pick up the DS II format and key automatically.
BinderTool "LqChrEbl.bdt" --game DarkSouls2 --type EncryptedBdt should be the manual way.

I succeeded!! great thanks a lot !
would you also be where to find the 3D model files of the characters? there are close to 130 files. I mainly look for bumps.
Cordially

Hello
is it possible to compress several files in .dcx? I can't extract the bosses?
Cordially

DCX files are mostly just wrappers around other archives (basically directories) or single large files.
You can try running a script to recursively extract all DCX files in your working directory.
The newest version of this tool has some command line flags that should also automatically unpack and decompress all archives. I haven't tested it yet with anything but Elden Ring.

Good morning and thank you for your answers. I will try to be more specific. I am looking to recover 3D models of characters and bosses in DS2. I extracted the .BDT and .BHD files. I end up with .BND files that are unfortunately unreadable on Blender or other software. I searched for several weeks with no results. Do you have a solution?
cordially

I can't support you with that. You'll perhaps find some answers in forums such as Xentax or Zenhax.
Model files use the .flver extension and someone might have created a tool to convert them to obj or some other format supported by Blender.

Thank you very much but I have already searched these forums for a solution without result. To believe that no one has succeeded. In Ds2 there is no .Flver. Everything is in .bnd

Hello, just to tell you that I modified a script found on the net and I managed to recover the files. Thanks again

For reference, on the Elden Ring branch there's an option to automatically extract .bnd files which are basically .tar-style files (multiple files concatenated) or like a .zip file minus the compression.

For reference, on the Elden Ring branch there's an option to automatically extract .bnd files which are basically .tar-style files (multiple files concatenated) or like a .zip file minus the compression.

Hello,
I am not looking to extract Elden Ring but DS2. I got there.