How to Defend Your Lair (The Monsters Know What They’re Doing)

Admittedly, this book is lacking the breadth of information to make it as valuable as his other books but it still deserves 5 stars when comparing to other authors. It's not his best book because it doesn't carry the same amount of vast utility to a GM but he set the bar really high with his previous works.

Helps develop better encounters by making lairs more sensible and nuanced. Different monsters react differently which makes players need to be more cautious in dealing with dungeons. Opens up opportunity for dialogue where something is well defended rather than just hack and slash.