you will find level 1 to 12 written by Mithrandir (if everyone knows his adress .....? )
It's not written by Mithrandir, must be.
"This is Foucter's detailed walkthrough taken from the old darkstone board"
Mithrandir, Feb 2010.
So, it's not a Mithrandir's walthrough but Foucter.
"For any comments or questions, you can e-mail me at selonn[nospam]teleport.com. Have fun!!
" Randall "Foucter" Rutherford; (from The Avenger readme).
Maybe it's a bit too late (after 10-20 years) to ask him a question, but you should try.
If you google Randall "Foucter" Rutherford you can find his profile in GOG (registered in 2010): https://www.gog.com/u/Foucter
..and the second email address: selonn[nospam]peoplepc.com. Replace [nospam] with @.
I bet, all email addresses are abandoned.
The other way is to find a sql backup of the "The broken Darkstone Database" and restore it.