Well, I can't really speak for the vast majority of the stuff, as there's
d20 stuff that even I don;t recognize in there, but I can say in detail that "Lands of Mystery" is very cool, as I wrote about three-eights of it in its original form.
It has four adventures, three of which I co-wrote.
"The Sirocco's Kiss" is a so-so adventure, with the low-level characters going up against a rakshasa and his cult. Was better in
2E than in
3E, where those ELs are all-important. I wrote the entire sourcebook section on the city, and edited the actual adventure.
"Night of the Rotlord" is about the characters wandering into a plague-infested village, and dealing with the mystery surrounding it. I edited the adventure, and wrote all the material on the diseases and disease system in the original
2E adventure (most of which made its way into the HackMaster system).
"Unguarded Hoard" is an interesting reversal about dragons and treasures. I designed the city and edited the rest.
I still have a small pile of the originals sitting around somewhere... they were "for use with your favorite fantasy role-playing system" (wink wink, nudge nudge), and published as "Kalamar Quests."
As you use Mystara, you might be interested to know that I wrote up a conversion to place "Unguarded Hoard" on Davania, in the region of the Amalur Lowlands. It's on the Vaults of Pandius here:
http://pandius.com/kalamar.htmlI never did get around to writing up conversions for the other ones...
