Jorune is a somewhat obscure RPG game setting, but many gamers will recognize the iconic Miles Teves art.

The background is similar to Tekumel, in that humans settle a world in the far future. But contact is broken and technology is lost, leaving humans to fend for themselves as just one of many intelligent inhabitants of an alien world.

See also: Empire of the Petal Throne: The First RPG with a Campaign World… TEKUMEL (1975)

The Jorune page at my RPG reference site

Lair of the Maustin Caji

1984 … Andrew Leker & Miles Teves & Amy Leker … 47 pages … Skyrealms Publishing

Jorune items in the shop

eBay: Maustin Caji | Jorune

Maustin Caji has the distinction of being written for the ultra-rare 1st edition of Jorune [see my reference site]. Ultimately, it is a comfortable dungeon adventure, Jorune-style. The party discovers a man who’d been held prisoner – unaged – for 20 years, and can lead the group to the lair of the rebellious Maustin Caji.

Credits and Table of Contents. I love seeing the old school dot-matrix printing.
The adventure module is lightly illustrated by Miles Teves, but they are excellent of course.