In the fourth installment of Keith Ammann's beloved The Monsters Know What They're Doing series comes a Dungeons & Dragons strategy guide for building the perfect lair: not only to protect and defend PCs, but to create combat settings that feel as real and alive as the monsters do. Defend yourself and protect your assets in a lair that feels as real and alive as your monsters with advice from Keith Ammann, author of The Monsters Know What They’re Doing: Combat Tactics for Dungeon Masters.

The world is a dangerous place—especially when you’re up to no good. Whether you’re a rampaging monster, a calculating mastermind, or the current possessor of the Golden MacGuffin, someone’s going to come at you. Probably more than one someone. You can’t know when, but you can choose where. You need to be ready.

You need a lair.

In How to Defend Your Lair, gamemaster Keith Ammann pulls back the curtain on an underrated but crucial part of any tabletop roleplaying game: the theater of battle. Say goodbye to encounters in randomly generated dungeons and hello to a game in which where the fight takes place is just as important as who is doing the fighting.

This book teaches you how to use real-world principles of building security and area defense to create strongholds infused with flavor, informed by narrative, and complex enough to force your players to think strategically. You’ll look at the strengths and weaknesses of both defenders and potential attackers, creating spaces that are strong enough to keep out ordinary intruders...and to provide thrilling challenges to extraordinary ones.

Including more than a dozen fleshed-out sample strongholds, How to Defend Your Lair is a crucial resource for any RPG gamemaster who wants to push players to think about how to solve problems before running at them head-on.