Ironsworn Lodestar, in my opinion, is the single most underrated resource & toolkit book I've picked up in the past 6-7 years of any TTRPG system. It's that fantastic, and I sincerely encourage anyone to check this out. The best part of it is, while obviously it is made as a supplement to use for Ironsworn, the enormous amount of GM guidance, random table generators, and worldbuilding tools can be applied to literally any TTRPG. If I had any two resources that can immediately be ported into any TTRPG setting, it would be Worlds Without Numbers, and Ironsworn Lodestar. Both are perfect.
Lodestar shines in that it gives tons of GM guidance for the specific PBtA (or PBtA adjacent/influence) Ironsworn game, and does a FANTASTIC job of presenting overview sections of all move types, categories and descriptions...that are well laid out, ultra intuitive to understand, and all locating in one easy to find doc. I honestly wish game designers made something this intuitive for every system, because more complex systems are dying for something like this, both for GM and player purposes, you can just flip it open and immediately find what you need for any Ironsworn game.
It equally shines as a generic/not tied to Ironsworn resource that is chalk full of random generators for everything from plot, worldbuilding, PC character building, character feelings and personalities, backstories, locations, villages, celebrations & disasters in villages or cities, random encounters, random events...all with tones stretching between happy to sad, to dark and spooky, to chivalrous, to joyful and celebratory to depressing or true danger or tragedy. It also has a fantastic section for name creation of both PCs, NPCs and creature types, as well as locations. Could be used for just about any system and setting that involves high or low fantasy, steampunk, or history.
It's just awesome, and for a resource so inexpensive, everyone should grab a copy. Kudos to the remarkably talented author Shawn Tompkin for creating Ironsworn, Starforged, and this excellent Lodestar resource!