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The revised and expanded edition of "must-have" (R.A. Salvatore, #1 New York Times bestselling author) The Monsters Know What They're Doing, an essential guide for all Dungeons & Dragons Dungeon Masters -- updated to include the latest rules!

In the course of a Dungeons & Dragons game, a Dungeon Master has to make one decision after another in response to player behavior -- and the better the players, the more unpredictable their behavior! It's easy for even an experienced DM to get bogged down in on-the-spot decision-making or to let combat devolve into a boring slugfest, with enemies running directly at the player characters and biting, bashing, and slashing away.

In The Monsters Know What They're Doing, Keith Ammann lightens the DM's burden by helping you understand your monsters' abilities and develop battle plans before your D&D game session begins. Just as soldiers don't whip out their field manuals for the first time when they're already under fire, a DM shouldn't wait until the player charaters have just encountered a dozen bullywugs to figure out how they advance, fight, and retreat.

Easy to read and apply, and now updated with the latest rules, The Monsters Know What They're Doing is essential reading for every DM.

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Price Summary

  • We started tracking this book on March 12, 2019.
  • This book was $13.99 when we started tracking it.
  • The price of this book has changed 8 times in the past 2,480 days.
  • The current price of this book is $9.99 last checked 12 hours ago.
  • This book is at its lowest price in the past 90 days.
  • This lowest price this book has been offered at in the past year is $1.99.
  • The lowest price to date was $1.99 last reached on August 2, 2025.
  • This book has been $1.99 2 times since we started tracking it.
  • The highest price to date was $14.99 last reached on September 4, 2025.
  • This book has been $14.99 4 times since we started tracking it.

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  • Text-to-Speech: Disabled
  • Lending: Disabled
  • Print Length: 559 Pages
  • File Size: 372 KB

We last verified the price of this book about 12 hours ago. At that time, the price was $9.99. This price is subject to change. The price displayed on the Amazon.com website at the time of purchase is the price you will pay for this book. Please confirm the price before making any purchases.