Take a Trip to Gnydron

In an abandoned fragment by Clark Ashton Smith Gnydron is "a continent of the far future, in the South Atlantic, which is more subject to incursions of 'outsideness' than any former terrene realm; and more liable to the visitation of beings from galaxies not yet visible; also, to shifting admixtures and interchanges with other dimensions or planes of entity." Smith's Gnydron eventually became his Zothique. 

Lester B. Portly has picked up the name Gnydron in the same way he's salvaged some gaming ideas of yore for a series of publications that aim to inject a bit of "outsideness" into the terrene realms of your standard OSE or other B/X-derived gaming. 

I have known Lester for a number of years. He did the layout on several of my gaming publications (in addition to the likely better paying work he did for Goodman Games), and I played in a pulp campaign he ran set in his interpretation of my Weird Adventures setting. Lester has also been a fan of true old school gaming with its incursions and visitations from other genres, based on fiction that was not so firmly and definitely categorized as fantasy is today. Each of these Gyndron supplements focuses on another subgenre of fantastic fiction (and gaming) that was once a part of the old school domain these days is often trimmed or shunted off to works dedicated to it in modern old school-derived systems. 

Supplement 1 is subtitled "Mystic Fantasy" and offers an AD&D-styled Monk class and a cool system of martial arts. It also provides a system of Psionics that again reminds one of AD&D's but this one is more streamlined and appears imminently usable. There's a bestiary of old school psionic-based monsters that have either been left out of or de-psionicized in OSE and other modern interpretations. Rounding out the supplement are some optional rules and a Saurid (lizard man) race-as-class.

"Science Fantasy" gets its due in Supplement 2. There is a star-farer class for playing those high tech individuals stranded on a fantasy world and the Vat-Born, a synthetic mutant class. To support these two, there's a chapter on high-tech equipment and one on mutations with an appearance table. Again, there is a menagerie of science fantasy monsters, many derived/adapted from classic modules like Expedition to Barrier Peaks. 

"Weird Fantasy" rises in Supplement 3. Lester gives us the Initiate class, practitioners of ceremonial magic, and adherents to strange deities, and the Formican race-class of eusocial, hive-dwelling humanoids. There's a system of ritual magic to support the Initiate, as well as a chapter on deities where you'll recognize some Lovecraftian Elder Gods and Old Ones, among others. Finally, there's a chapter on Monsters from Appendix N. Lester really did a deep dive here, and I confess I didn't catch all the derivations, but I see creatures from multiple Burroughs series, works of Jack Vance, and the Gondwane tales of Lin Carter, among others.

All of this is presented in the nice, clean layout style Lester does so well and enlivened by the always flavorful artwork of Zhu Baije.

If you play OSE or other B/X inspired rulesets and dig Appendix N fiction, then these are a must. Even if you play a bit more variant old school ruleset and like those sorts of inspirations, they are worth your money to have all this content for easy adaptation.

If drivethru isn't your preferred shopping site or if you want POD, you can also find the Gyndron supplements on Lulu and RPG Trader.