Worldbuilder’s Library

Our research. Your world.

Worldbuilding is fun. But unless you want to spend a decade rewriting your setting, it best to use well-researched materials from day one.

Worldbuilder’s Library is a collection of articles, books, zines, and decks written and illustrated specifically to help fellow worldbuilders create their universes.

Created by the team of writers, worldbuilders, and designers at Double Proficiency, the Library aims to cover all ground between the natural world, magic, folklore, technology, warfare, and best adventuring practices. Whether you’re in need of magical plants, engaging encounters, or are just fighting a writer’s block, the Library has something for you.

Let yourself get inspired.

Pick a topic

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boat on calm lake reflecting limestone mountains at sunset


old building facade with ornament under light sky in city


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Latest Posts

Introducing Blazing Aurorae RPG

I don’t always write blog posts, but when I do, I don’t know where to start. I’ll start at the beginning then – and I’m not one for long introductions. And so, welcome to the introductory blog post about Project Aphelion’s parallel upcoming game, Blazing Aurorae. Please leave this field empty Oh hello there 🌸It’s… Read More

Calendula: magic, medicine, and folklore

A popular garden plant, grown for its beautiful golden and orange flowers. Often used to cure skin irritations, strengthen psychic powers, and see through illusions. Calendula officinalis. Also known as: Marigold. Pot Marigold. Ruddles. Summer’s Bride. Family: Asteraceae | astersHabitat: warm and temperate, widely cultivated in gardensSize: 30—60 cmLife cycle: perennial or annualForaging: flowers and… Read More

13 Spookiest Plants For Your Halloween Game

by Anna Urbanek Get ready for the spooky! Today we will be talking about the spookiest plants you can put in your Halloween game. We’re not here to discuss the most toxic plants, because let’s be honest – death by poison is a rather boring thing to play out at the table. Instead, we’re about… Read More


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