Standardized forts that have been altered over time.

Frontier Forts of Kelnore is a 1978 supplement published by Judges Guild, written by Dave Sering with art by Sering and Jennell Jaquays. The module provides a modular system for generating frontier forts based on a single standard map, allowing Game Masters to randomly populate the ruins with traps, treasure, and monsters. The map above is not the original artwork.