I’ve just picked up (from kickstarter) Rowan Rook and Deckard’s SIN – a fantastic supplement for the SPIRE RPG, where every page seems to have plot hooks and gameable material leaping off it. It got me thinking about what a really good RPG supplement looks like. For these purposes, I think a supplement should have a bit of everything – some player-facing stuff, maybe new rules, new setting material and background – but most importantly, tons of stuff that can be dropped into an ongoing campaign or inspire a one-shot. 

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SIN hits the jackpot on all of these – but I won’t be talking about it yet, in accordance with my review policy, because I haven’t actually used it in play yet. So instead, here are 4 supplements – I’ve tried to restrict myself to things nominally in print at least (although getting physical copies of one of these might be a challenge!) – that are top-drawer and have seen action at my table recently.

Strongholds of Resistance (for FFG’s Star Wars: Age of Rebellion)

This is the one you might struggle to find in print. It’s worth it though – a selection of planets, a selection of rebel bases (including, of course, Echo Base on Hoth), three new player species (including the squid-faced Quarren as featured in the Mandalorian) and some equipment and options. What makes this stand out are the planets and bases – they are all dripping with gameable content, and even include a “what if this base is discovered / falls” section. The bases all have maps which can be used here, or even transplanted to another setting or system.

This book entirely inspired Snowblind, a one-shot around Echo Base, which is linked here.

Book of Demons (for 13th Age)

This is absolute gold. It kicks off with the Demonologist class, which has three very different options (if you’re familiar with the 13th Age Druid, it’s similar to that in that the role in the party can be anything depending on what you pick). There’s a great section on gamemastering demons, and then “Six Hell Holes” – adventure locations at different levels of challenge full of demons. Explicitly designed to be dropped into the game anywhere, this would be useful for any kind of fantasy game. 13th Age products somehow manage to make even their fluff easily usable in other games, and this doesn’t disappoint.

I’ve thrown stuff from this into 13th Age one-shots (although not for a while – I haven’t run 13th Age for too long!), including adding a melee-focussed demonologist as a pregen. 

Beta Quadrant Sourcebook (for Star Trek Adventures)

For those with limited Star Trek knowledge, the Beta Quadrant is probably what you’re expecting if you think Trek – the baddies are Romulans and (depending on the era) Klingons, you’ve got Orions and (my favourite) Gorn rolling around – it’s a wild frontier region of space, ripe for exploration yet still bucking up against other civilisations in the form of the Romulan Neutral Zone. Apart from details of each of these civilisations and some new player species, there’s some extra starships, and some adventure locations. The Briar Patch and the Shackleton Expanse (although for the latter you might want to get the bigger – and more adventure-led – book of the same name) are full of danger and peril.

Overall it’s just a great starter region for Star Trek, where the core book is a bit limited by offering any era of play. If you’re running Original Series or Next Generation, this is your essential next purchase.

I used this a lot in the first season of my ongoing Star Trek Adventures campaign, where they tussled along the Neutral Zone with a recurring Romulan Captain.

Starter Set (for Warhammer Fantasy Roleplay 4th edition)

Is it cheating to put a starter set in here? Not in this case. Apart from the usual pregens, dice and an excellent adventure (Doing the Rounds), the 64-page Guide to Ubersreik is what sets this apart. Full details of the city, with adventure hooks in every location, both dripping in flavour and instantly gameable. Add to this that fully half of the Adventure Book is given over to single-page short adventures, this is the perfect primer for both what WFRP is all about, and how to make a city breathe and sing.

My WFRP one-shots have all been set in and around Ubersreik – there’s just enough material in here to expand one or more of them into a satisfying game.

So, what fantastic supplements can you recommend? Link them in the comments.