I recently picked up The Planewalker's Handbook off of Amazon. I really enjoyed it and would highly recommend it to any DMs or players who are interested in introducing planar travel, or the planes in any way into their campaign.This book is amazing. It is completely player-friendly, but a great pickup for any dungeon master. I found a ton of inspiration in this book that I'm going to use in my upcoming adventures.I know that the 5th edition Dungeon Master's Guide does a good job of explaining the different planes and updating the multiverse, but it doesn't spend much time on what it is like to BE a planewalker. Each plane is explained in amazing detail, including a great introduction to Sigil, the capital of Outland and home of many gates and portals.The best thing about this book, is that even though it is written for an older edition of Dungeons and Dragons, there are very little rules or statistics in the manual that couldn't be easily adapted to any version. Most of the rules are explained without referring to stats or rolls, such as how portals are opened or closed, or how to join a faction.The information on planar factions are the number one reason I would by this book. The factions are split up not by race or geographic location, so much as ideals and belief systems. My favourite faction, one that I am definitely going to introduce into my campaign, is the Sensates. The Sensates are a faction who's sole desire is to experience as much of the multiverse as possible, through their senses (thus the name) of sight, sound, touch, taste, and smell. They store the memories of these experiences in a vault at their headquarters, that others can come and experience.I would highly recommend this book. It is fun to read, and super easy to adapt to whatever RPG system you are currently using. Buy it here if you feel like supporting me, if not I definitely think you should seek it out.