The Rules to Play in Mun-Dun
This book will not lay out the entire Player's Handbook for 5th Edition D&D or any of the supplements used. Refer to those in question for all basic rules and mechanics for playing in this campaign. This book should contain all the basic rules that have been changed (if any) or tweaked, as well as variant rules and homebrew that have been added to this campaign. It is not intended to be an exhaustive and all encompassing guide as things may get changed during playing a campaign. It is intended to be a starting point for playing a campaign in this world. As usual, The Rule of Cool remains paramount.

World Codex