Pathfinder GM Core Review

GM Core is why Pathfinder prep goes fast for me. It's the book I measure every other game's GM tools against, and most of them come up short. It's a 16 out of 20, a Hit. The setting is thin. Everything a GM actually uses is excellent.

This is one of the remaster's core books. For the system as a whole, see our Pathfinder 2e review. The player side is in the Player Core review, and the monsters are in Monster Core.

What I reviewed

My special edition hardcover, faux leather with two ribbon bookmarks, plus the PDF from my Paizo subscription. GM Core came out November 15, 2023, alongside the Player Core, at 336 pages. I ran Curse of the Crimson Throne with it after the remaster, and I run Pathfinder most weeks.

Rules17/20

Here's what GM Core does better than anything else on my shelf: it tells you exactly how hard a fight will be and exactly what the party should walk away with.

Encounter budgeting is clean, fast, and it works. Pick a threat level, spend the budget on creatures, done. When I reviewed Draw Steel, my biggest complaint was that every reward ran on a different clock, and I said I wanted one table that tells me what the party gets each level, like Pathfinder has. This is the book with that table. A simple session took me about four times as long to prep in Draw Steel as it does here.

The remaster also merged in the best of the old Gamemastery Guide: hazards, building your own creatures, and subsystems like influence and chases. Those used to live in an optional book. Now every GM has them, so a tense negotiation or a chase gets real rules instead of a pile of skill checks.

Then there are the Adventure Recipes. Each one is a style of adventure, like a dungeon crawl or high adventure, with structured advice for building it. New GMs get a blueprint. Experienced GMs get a checklist they'll actually use.

My honest take: I live in two chapters, encounter design and treasure. The rest is there when I need it, and when I need it, it's good.

At the table, it's the book I'm reading from when the party identifies a magic item and someone asks what it does.

Layout17/20

It's laid out like every Paizo book. If you've used one, you know where to look, and that consistency across the whole line is rare. The art is high quality throughout.

On the special edition, the two ribbons aren't decoration. One stays on the encounter rules. The other marks wherever I am mid-session.

Setting12/20

GM Core holds the Age of Lost Omens chapter, the GM side of Golarion that used to be in the original Core Rulebook. Players get the short tour in the Player Core. The GM gets the fuller picture here.

Fuller, not full. Each major region gets about half a page. That's enough to pitch a campaign or answer a player who asks, "What's Ustalav like?" It's a tease, not a toolkit. Run a long campaign in any one region and you'll be buying a Lost Omens book.

I love Golarion. This chapter just isn't where it lives.

Value16/20

GM Core replaces two books. In original 2e, the full GM toolkit was the GM half of the Core Rulebook plus the Gamemastery Guide. Now it's one book, and my players keep their own Player Core at the table instead of fighting me for the only copy.

The catch is the split. Original 2e GMs bought one Core Rulebook. Remaster GMs buy two. And if you already owned the Gamemastery Guide, you're buying a lot of it again.

Be honest with yourself about why you're buying it, too. Every rule in this book is free on Archives of Nethys. What you're paying for is the physical book, the art, and not having a laptop between you and your players.

Like the Player Core, it comes as a standard hardcover, a special edition and a pocket edition, and I went special edition for the same reason: faux leather survives a book that comes to every session.

The two-book split still bugs me in principle. At the table, it's earned its keep.

Who it's for

Every Pathfinder 2e GM. If you run the game, this is the book you prep from. If you're a player, you don't need it.

The verdict

A 16, a Hit. The best encounter and treasure tools in the hobby, finally in one book. Pair it with a Lost Omens book if you want to go deep on Golarion.