Once Little Soldier and Phoenix went belly up in 1981, Lou Zocchi’s Gamescience bought the “Book of” series. I believe either dead stock or reprints of Monsters and Demons came out with Gamescience branding. Later, all six were collected in this, The Fantasy Gamer’s Compendium (1983).

I have seen the digest versions of three of these in the wild (for frankly bonkers prices): Book of Shamans, Book of Treasure and Book of Sorcery. Shamans is a whole new class, complete with a custom spell list, that is framed around accessing the spirit world in a way that reflects I guess broad assumptions about tribal magical systems. Its OK! Treasure is what you’d expect, a collection of magic items pulled from myth and legend in the first part and from genre fiction in the second. It is pretty good! Sorcery is an interesting, if slightly unwieldy reconfiguration of the magic user class, explicitly arranged around demonology and pulp notions of Western occult traditions. Basically, it’s intended to provide mechanics that allow a class to summon all the folks listed out in Book of Demons. It also has a collection of occult-themed magic items, like the Hand of Glory, that I find delightful. That’s probably the most useful thing for me, personally, in the whole “Book of” series.

The last Book collected here is the Book of Mystery, which I am not sure ever saw print as a standalone Little Soldier product. It presents a new class (Lord of Mystery), the new skill system those characters use, and an organization they belong to, which safeguards high science for a time when humanity is ready for it (the Lords of Mystery are descended from the original humans, who crashed here [wherever that is] in a colony ship millennia ago). Many of the class skills are trained and require quests. They seem to get access to a lot of abilities. It seems like a pain in the butt, but an interesting one, almost like a more monastic version of Dave Hargrave’s Techno class from Arduin.