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GameMastery Guide / Running a Game / How to Run a Game / GMing Style Choices

Pregame Preperation

Source GameMastery Guide pg. 24
While this topic is covered in depth in Chapter 1, below are a few key points to remember.

Read the Adventure: If you’re playing a published adventure, read through it at least once. It also helps to reread the parts of the adventure you expect the players to tackle in the upcoming session, to keep it fresh in your mind.

Predict Player Actions: Try to guess what your players might do in a given situation. If you think they might go to a tavern to get info, think about what NPCs will be encountered there, and what information they may have to impart. Likewise, if you think they might use subterfuge to get into a fortress, consider how the inhabitants might react to various plots. A little foresight goes a long way.

Adapt to Players: Consider tailoring your adventure to take into account the backstories of certain PCs, or incorporate a subplot that players initiated in a previous adventure. If one of your players is a paladin who hates devils, think about changing the generic cleric villain to a priest of Asmodeus to get your PC more invested. By tying your characters into the plot, your story naturally has more impact.

Review Relevant Rules: As you’re reading through the upcoming portion of the adventure, take time to familiarize yourself with relevant monsters, feats, spells, magic items, and rules subsets. Part of your job as the GM is to play NPCs and monsters to the best of their ability, which means being as familiar with the NPCs’ options as your players are with their own characters’.

Prepare Stats and Strategies: Make sure the adventure’s challenges are appropriately balanced for your party’s level and composition. Think about the locations where the encounters take place, and how NPCs can turn the location and their particular abilities to their advantage. It can also be good to copy the stats for each NPC and monster for ease of reference, allowing you to make notations on spells used, hit points lost, and other information without marking up a book.

Prepare Additional Tools: If you use props in your game, preparing in advance helps the game flow smoothly. Pick the miniatures and any three-dimensional terrain you want to use in a given session and put them in an easily accessible place. Put any pictures you want to show in a folder on your computer or print them onto sheets. If the players have the map to a dungeon level, think about drawing the level on the battlemat ahead of time.