This Appendix contains tables for both the generation of dungeon or wilderness adventure areas (maps or terrain types) and the placement of inhabitants in adventure locales where the DM requires assistance to do so.
Dungeon Generation includes tables to build a map of a dungeon complex on the fly and fill it with challenges.
Wilderness Generation includes tables for terrain generation as well as habitation type (if any).
The procedures and tables for determining random monster encounters during the course of a campaign are given here. The state of [1.25] is such that new and different creatures are being devised regularly and often, so that by-and-large, the only monsters which are included are those in Monster Manual. You may do this for yourself now—and include your own favorite creatures at the some time—by finding the experience points value of such monsters and equating them to those already found herein.
Determine the frequency (common, uncommon, etc.) of the new creatures, and then include them on the appropriate tables by adding them after comparable monsters already shown. Be careful not to upset the probability balance.
Random monster tables are included for the following types of encounters: