My most used book is my copy of Dungeon World but my most used accessory is definitely my notebook, filled with session notes, sketches, and stories. Ah the thrills of the forever GM.

I’m primarily playing Pathfinder 2 these days, so I make a lot of use out of digital resources like Pathbuilder and pf2easy.com. I also lean pretty heavily on Trilium for session prep and notes, but I’m a chronic over-preparer and struggle with improvising the world on the spot.

I use a lot of roll tables during prep. I have several of the Gamemaster’s Guide to ____ books on my shelf that I pull out whenever I’m wireframing a dungeon, and I have a lot of the Raging Swan pre-built settlements that I leaf through and drop into my world when the players need a town to come across.

I also find myself turning to GM advice books every few months, just to skim over things. Right now, So You Want to be a Game Master, Robin’s Laws of Good Game Mastering, and Return of the Lazy Dungeon Master (Eh? Ehhhhh?) seem to be the ones that end up on my desk. I can safely assure you, one of the advice sinks in, but I usually have my best streaks of sessions after reviewing things like these.

I also find myself returning to modules from 3.x. They were the ones I first played, and they’re (mostly) pretty easy to convert to PF2. We’re currently just wrapping up Forge of Fury – or we will, once I finish converting the Allip.

For d&d? 5e.tools’s DM screen on a laptop is excellent, it has an encounter tracker, calendar, dice roller, and I can pin whatever rules and statblocks I need this week.

Also a giant battle mat is really useful.

…i’m tempted to say physical dice, but in truth i have many sets and switch them out for each campaign, so my most-used accessory is probably my nice padded rolling tray, followed closely by my staedler stick eraser…

…my most-used books, despite my meticulously-curated physical and PDF libraries, have turned out to be the player’s handbook and dungeon master’s guide on DnDbeyond; i always keep them open on an ipad stand during gameplay because it’s really tough to beat indexed hypertext for ready-reference during gameplay…my players use the heck out of my shared campaign subscription, but it’s becoming tougher now that DnDbeyond defaults to 2024 rules, so that use pattern may well change as the platform evolves…

…even as a player, though, i feel like a good DM’s screen might be quicker!..the problem of course is tabletop real estate, but it seems like there’s an untapped market for player’s reference screens during remote sessions, where most folks have more tabletop real estate to play with physical accessories…

…i’m considering crafting a player’s reference screen with panels focused on core rules, house rules, and class rules which can be readily swapped-out…

Monster tokens are probably one of my “unsung heroes” of gaming when it comes to travel; I know people (myself included) probably always go to with minis, but if i’m going to a convention, traveling for the holidays, etc. tossing a whole pile of tokens into a bag make for great addition. No particular brand, just whatever i’ve picked up over the years.

Shawn Tomkin’s Ironsworn series. Delve I regularly use for setting up point crawls. Ironsworn/Starforged/Sundered Isles have great collections of random tables, I use the book thematically most fitting for the situation at hand. The core tables of Action, Theme, Descriptor and Focus all get heavy use.

Kevin Crawford’s [SOMETHING] Without Number series have awesome tables as well. These however get more use when I need more detail. Prep stuff. Again most thematic book is picked first but I do have used Cites (cyberpunk) for fantasy cities.

When I want to create background for “medieval fantasy” characters I pick up Burning Wheel and burn something up. Through that I get a good selection of relevant skills to sue (for flavor)

Anything related to cosmos and mythology I say HELLO! to my growing collection of Glorantha material. From cult books to magic tomes and Atlases.

Historically it would be either my 2nd edition Werewolf the Apocalypse book, Paladium Fantasy Core book, or WEG’s Star Wars d6 core book.

Currently my 5e.2024 PHB.

Having scrap paper and pencils on hand is my go to. Even running online it’s nice to have and I find, if I don’t have it, I end up needing it.

I keep going back to the Fate core and supplement books. They just have such good GM advice.

Lately, Discord seems the unifying tool among all my tables. I’m currently playing 2300AD, Firefly RPG, and Storycaster. So not really conventional games.

Playing PF2e mostly these days and the Archives of Nethys are my life raft. I would be utterly lost without them. That and Pathbuilder to help have a handy character sheet accessible for theory crafting or whatnot.

Otherwise, I use the compendium in Foundry to look up conditions or rules on the fly.

Although when I GM I use Notion for prep, Lazy Dungeon Master’s Guide for some guidance here and there, and just a lot of flying by the seat of my pants. :B

Is that a faux Crown Royal bag?

I mostly play online using Foundry these days, but it’s reference my physical copy of the Savage Worlds Adventure Edition CRB a lot

@slyflourish My most used accessory is a Pathfinder magnetic Combat Pad I bought back in 2011. Little magnets I can write on with wet erase markers, then shuffle around to make the initiative, plus space to scribble with wet-erase to track hp and stuff.

Fantastic tool.

I only things I have used multiple years are mainly for DnD 5e 2014:

• Monstrous Races - a supplement that turns everything from official Monster Manuals into playable races with a lovely commentary about how these were balanced.
• Conflux Creatures - just better creatures, this is the first thing I do is to replace monsters of premade adventures with the Conflux ones. They are just much better experience compared to sacks of HP that most 5e monsters are. There is no need to read “Monsters know what they are doing” when the stat block pretty much does it for you.
• Creature Loot by Medieval Melodies: https://medievalmelodies.blogspot.com/2017/06/creature-loot-intro.html - lootsies + crafting for all of the creatures.
• The Alexandrian: thealexandrian.net for reviews, advice and remixes of official campaigns
• Official WotC products besides the campaigns: Fizban’s Treasury of Dragons for all of the Dragon Lore