r/mattcolville - Creating 5E Random Encounter Tables using 1E & 2E Sensibilities

1st and 2nd Edition D&D had a "Frequency" field for every monster, which was used to determine how likely that monster may be encountered in a given area or region where it lived. In the 1st Edition Monster Manual, it describes four types of frequency: Common, Uncommon, Rare, and Very Rare.