Worldbuilding Series: Magic Systems Masterpost

​“Power swirled through their veins, burning tracks down their spine and bursting through the cracks in their mind.”

Magic. It’s one of the defining characteristics of the fantasy genre. A writer has unlimited possibilities to choose from when building their world and the magic that shapes it. Flying. Shapeshifting. Characters wielding fire or healing with a touch. Magic potions and runic spells. Demon magic and necromancy. Witch marks and superheroes.

This guide is designed to walk you through each step of building your magic, from choosing the structure to figuring out how it's cast and what powers are included. Hopefully by the end of this post you have a clear path to building a workable system of magic for your fantasy world.

Let's make some magic...

Step One: Capturing the Feeling

Before we do anything else, take twenty minutes right here to do a free-write on what you want from your magic system.

• Ask yourself: what emotions do you want your magic to create? In the reader? In your characters? In yourself? Do you want it to feel mysterious, mystical, disturbing, epic, powerful, sacred, moral, industrial, historical, epic? 
• You could also think about the story you’re telling: Is it an epic saga akin to Stormlight Archive or Wheel of Time? Or is it a smaller, character driven story like Fire by Kristin Cashore? Or a story about political maneuvering within a single kingdom like Twelve Houses by Sharon Shinn? The type of story you’re telling can help determine the magic system you use. 
• The bottom line is you want to capture the feeling of your magic.

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Step Two: Choosing a Class 

In my mind, magic systems fall into two major classes: Ability-Based and Spell-Based. 

• Ability-based is your basic superhero system — mages have a certain ability (or abilities), which could range from controlling light to super-speed. Their powers aren’t infinite. Mages could each have different, unique abilities, or they could choose from a set class (like Mistings from Mistborn). 
• Spell-based is your more classic magic — mages use power to cast spells, all (or most) have access to the same range of powers, and there are near infinite spells to choose from.

Like I mentioned in Step One, your choice should depend on the story you want to tell. 

• Think about your plot, world, and themes while we’re going through the two classes: which one will highlight or enhance the story you are telling?
• Think about your characters: which class will fit them best? 
• Which one would you have the most fun writing? 

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Step Three: Theme

Once you know the class of your magic system, you need to consider its theme. This is where that free-write about the feeling of your magic is going to come in. Look at what you came up with. The emotions you wanted to evoke. The atmosphere. This is going to become your theme. 

• For instance — if you wanted your magic to feel disturbing, then maybe your theme will be necromancy or death magic. 

Your theme is there to limit your magic. It will keep your system from feeling arbitrary, and will enhance the overall feeling of your world. It’s going to help you focus your abilities, powers, and limitations to create a unique system.
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Step Four: Hard or Soft System

Some authors prefer to keep their magic shrouded in mystery and mysticism, while others love to lay out the rules and possibilities of their system with as much detail as a scientific experiment, with histories, theories, and runic charts in the back of the book (looking at you, Sanderson). Most systems are somewhere in the middle of the scale. You need to decide where you want yours to fall. 

While deciding, consider Sanderson’s First Law of Magic: “An author’s ability to solve conflict with magic is directly proportional to how well the reader understands said magic.”

• If your reader knows and understands your magic, then you can use your abilities, powers, and cool effects to solve problems. 
• If your reader doesn’t know the rules, the powers, or how your magic works, then any time you use it to solve problems or plot issues, it will feel like deus ex machina. Though you can still use magic to cause problems and make things harder for your characters.
  

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Step Five: Your Magic's Source

What is the origin of your magic? Power has to come from somewhere, assuming your world follows the laws of basic physics (which it doesn’t have too, but I would recommend having some sort of accepted laws of reality).

A few things to think about: 

• Is your magic powered by the character themselves (does it exist inside them)? Or do they need to draw on an outer source?
• Remember that you can combine sources — such as in Mistborn, where ingesting metals gives the allomancers power, but that power is ultimately fueled by the god Preservation. 
• For the future: the source of your magic is going to play a large part in the limitations, rules, and abilities of that magic. For instance, if magic is fueled by the caster’s own life energy, it will severely limit the amount of spells they can cast. But if magic is an unlimited river of energy that runs through everything (like the Force), it will be much more abundant for huge epic magics. 

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Step Six: Powers & Abilities

I’m sure you have some ideas already, but now is the time to solidify what powers your magic grants or what spells your characters cast. 

Stick to Your Theme: The most important thing here is to limit your powers with your theme. If you don’t, you’ll loose the theme completely, and your system will feel arbitrary and overused. Try brainstorming a list of powers or abilities that could fall under your theme. Note that this is the same if you are designing a spell-based system of magic or an ability-based system.

• If you’re having trouble coming up with powers, then make the limits of your theme more general. If your powers feel too disconnected and random, then make your limits more specific.

Here are some other questions to consider: 

• Do all of your characters share the same abilities? Do casters get to decide what their ability is (a conscious choice) or are they simply born with a certain range of magic? Are some things harder to do than others?
• Have you given your characters abilities that make them too powerful? Could they break the world, tear a hole in reality, or some other effect that would make your plot meaningless?

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Step Seven: Casting Your Magic

Waving a wand, drawing a runic spell, gathering your will, burning metal, singing the right notes, or speaking an objects true name. Whether it’s with a thought, a gesture, speech, or a material object, there are as many ways of casting a spell as there are spells to cast.

Consider Your Theme and Story: The important thing here is to find how your characters use magic: what fits with your story, theme, and characterization? Will your characters cast spells against the forces of evil on a desolate battlefield, or will they use rituals and herbs to heal the sick in a wooded cabin, or sing their magic into being to cast illusions for the royal houses? An elaborate ritual won’t be very useful for a battle mage or a spy embedded in a foreign government.
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Step Eight: Magic Users

You know what your magic can do, you know its source, and you know how it’s harnessed. Now you need to decide who has power.

Consider Your Characters and Story: how do those who use magic see themselves? How are they seen by others? Here are some questions for you to consider: 

• How accessible do you want magic? Is it limited to a certain few or can anyone use it? 
• If anyone can use it, do they? Or are there some who shun it?
• Are mages simply born with magic, or can it be gained through training? Does it have to be stolen or bargained for? 
• Do people with magic think it’s a curse or blessing? Are your characters proud of their powers, or ashamed by them? How does this affect their personalities and motivations? 

Consider Your Theme: go back to the feeling of your magic. What is it? What type of person fits into it? What kind of world does your magic exist in? Is it hidden and mysterious or built into the very fabric of your culture and civilizations?
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Step Nine: Limitations

Consider Sanderson’s Second Law: Limitations > Powers. 

• This law is basically saying that your magic’s limitations should be stronger than your abilities. If your abilities are too overpowered, then your magic could end up breaking your story and plot.
• The limitations of magic bring tension, drama, and risk to the story. They keep magic from being an easy way out by making your characters work harder, which can in turn up the stakes of your plot. 
• They can be the most interesting and engaging part of your system. For instance, mages that can control fire are pretty common, but what if a mage could only control fire if they were being burned at the time? That’s unique, interesting, and has story potential. 

You build your limitations by determining the Rules, Cost, and Weaknesses of your magic. They may seem similar, and in some ways they overlap, but it’s important to consider each separately to build a complete system of magic. 

• Rules — what magic users must follow (could be breakable, with disastrous consequences, or absolute and above mortal control.) What can't your magic do? What are the limits or boundaries of its abilities? Remember, once you decide on your rules, you need to stick to them, or your magic won't feel believable. 
• Cost — the price a mage pays to cast magic. This could range from energy or stamina to actual life force or simply material cost or money. Remember, the higher your cost, the less your characters will use their magic. 
  • If you want it to be a common and everyday thing, then you need a small, manageable cost. 
  • If you want magic to be used only as a last resort, then have a high cost that few would think is worth paying. 
• Weaknesses — where does the magic fail? What can’t it do? How can it be beaten? What ways would the opposite side overcome the advantage of the mage’s power, workaround it, or make it useless? Weaknesses are intertwined with both the cost and rules of your magic, and so they may overlap. Take a look at your rules and costs and extrapolate to find the weak points of your magic. 
  • For instance, if a rule of magic is that a mage has to see something in order to cast a spell on it, a weakness would be that their enemies could simply stay out of sight, or find a way to blind their opponent in order to make their magic useless. Could an enemy permanently blind a mage, and take away their power forever? 

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Step Ten: Extrapolation & Organization 

Go deeper, not wider: a magic with unlimited power can be fun to play with, but it could be more unique to have a magic with a small collection of powers, that are each explored in depth.

Remember Sanderson’s Third Law of Magic: “Expand what you already have before you add something new.”

• Before you start to add multiple abilities, schools, types, or magic systems together, consider the implications of what you already have: even an ability as simple as making plants grow could be used in dozens of different ways. 
  • Could your character bring down a building by crumbling the foundation with tree roots? Could they grow a poison to take out an enemy? Could they grow foliage in order to hide from pursuers? Or grow a vine to climb up a cliff? How could your characters solve their problems, using what they have in different or unique ways?
  • Two characters with the same power can use that power differently. This can be a good way to go deep into characterization and personality, and really show how each character sees the world. Perhaps the power is manipulating bone — one character might use their power to heal, and mend, while another might use it to break bones and control their criminal empire.

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Step Eleven: Name of Magic

There’s a lot to consider when naming your magic: here are a few questions to ask yourself.   

• What’s the magic itself called? Magic? Mana? Force? Energy? Or something unique like Aon Dor or BioChromatic Breath? 
• What are mages called? Wizards? Casters? Or something like Mistborn, Shapers, Riders, Radiants, or Powder Mages? 
• What is the act of magic called? Do mages cast a spell? Or weave a thread of magic? Or burn metal? Or draw in Stormlight?
• Are there multiple names for the magic or magic users? If you have different cultures, nations or planets, perhaps they have their own words for mages. Like Dragon Riders and Argetlam (meaning silver hand) from Inheritance Cycle. 

Consider your theme, or an element of your theme: what is the main focus of your magic? Does it have to do with fire? With metal? With wood or plant growth? Whatever it is can help you decide your names and terms. 

• Perhaps your characters are members of the thieves guild, and they’ve been hired to steal a magic gem from a corrupt lord. Perhaps magic in this world manifests as an ability to see through any wall, a skill perfect for thieving, so Thief is synonymous with mage.
  

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Just Like Magic!
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“Starlight fills the corners of the night, dancing in the space between worlds. Spinning dust in the hearts of stars, it creates worlds full of magic.”

​And that’s pretty much it. You now have a working magic system. As you start to write your story and further flesh out your world and characters, you’ll need to edit your magic accordingly. You’ll always be thinking of new things and exciting additions, but now that you have the bones, your magic system can grow to be functional, unique, and engaging for your readers.

I'd love to hear your thoughts on if this post was helpful! You can either comment down below or find me on my various socials across the web (linktree here).

If you enjoyed this post, I go into even more depth for each step in my downloadable Magic System Worldbuilding PDF Workbook and my even more extensive Ultimate Magic System Notion Template. And since you made it all the way through this blog post, here's a link for an exclusive promo code for my Magic System Notion Template!​

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about the author
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Megann is a speculative fiction editor, writer, and artist specializing in fantasy, science fiction, and basically anything with magic. Or dragons. Or starlight and spaceflight and gods that walk the worlds. A tendency to research extensively means she has a lot of worldlbuilding info to share and an obsession with building Notion pages for everything means she has a lot of template ideas for every aspect of writing.