1: Caliban is an adventure scenario for player characters of levels 8 and higher, a four-level dungeon containing both new monsters and magic items, and the package includes four maps.

[1] At 25 pages long, Caliban contained maps with room descriptions and trap matrices, four full dungeon/tower levels with maps and room descriptions (one level is an intricate cavern system), eight pocket sized magic artifact cards and eight illustrated monster cards with statistics.

1: Caliban was written by David A. Hargrave, with art by Greg Espinoza, and was published by Grimoire Games in 1979 as a 25-page book with two cardstock sheets.

[1] Shannon Appelcline identified Arduin Dungeon #1: Caliban (1979) as Grimoire's first original publication, appearing very early in 1979, and "authored by none other than Dave Hargrave himself.

Though he wasn't planning to write any more rules for Arduin, Hargrave was happy to design some adventures that showed how his game worked—and Caliban was the first.