The Monsters Know What they are doing : Combat tactics for DMs by Keith Ammann 3 out 5 stars. This is for people who have never DM and only for 5E. The author breaks down the abilities of monsters attacks and spells and give suggestions on how to use them in combat. I recommend you buy the hard copy version so you can pencil in notes and cross reference to the monster manual. But since this is just his blog posts dumped into book form, the book IS BORING. It took 3 weeks for me to finish the kindle version. If you are going to buy the kindle version buy under $4.