During the trial where the would-be mages are learning to levitate a rock in The Witcher, Tissaia has one of the mages levitate the rock, but her arm turns black. Tissaia then explains that nothing is for free. The next mage tries to levitate the rock, but she holds the flower in her other hand and it turns black and dies.

The lesson was that you don't get magic for free, something must be sacrificed. So what is it that they sacrifice during the rest of the show while performing magic?

Is it their womb? Is that why it's removed during the ascension? If so, what are they sacrificing before then?

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    I can only comment on what I know from the books, but there the mages actually draw energy from their surroundings, specifically the elements. And the prevalent attitude seems to be that there's generally enough of it around. – Napoleon Wilson Jan 8 at 18:11
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    Mages are sterilised to prevent creating children with inherent magical powers - in most cases, such children end up crippled or insane - witcher.fandom.com/wiki/The_Poisoned_Source - but there are exceptions, for example, Geralt himself, who thanks to that could pass more advanced mutations or certain extremely talented wizard (which I won't name to avoid spoilers) who is also a total psychopath. – Yasskier Feb 13 at 20:58

According to the books, magical energy is drawn from The Force, which can be accessed through one of the four classical elements:

“Why do we always draw the force from water veins? Magical energy, after all, is everywhere. It’s in the earth, isn’t it? In air, in fire?”


“And earth… Here, there’s plenty of earth around here. Under our feet. And air is everywhere! And should we want fire, it’s enough to light a bonfire and…”

“You are still too weak to draw energy from the earth. You still don’t know enough to succeed in drawing anything from air. And as for fire, I absolutely forbid you to play with it. I’ve already told you, under no circumstances are you allowed to touch the energy of fire!”

  • Blood of Elves

Wizards generally treat the force as an unlimited resource, though it in likelihood is not (analogous to how humans have historically treated natural resources: oil, wood, ores etc.):

How does it work with this drawing of the force? If I gather force into myself then there might not be enough left down below. Is it right to do that? Mother Nenneke taught us that we mustn’t take anything just like that, for the fun of it. Even the cherry has to be left on its tree for the birds, so that it can simply fall.”

Yennefer put her arm around Ciri, kissed her gently on the hair at her temple.

“I wish,” she muttered, “others could hear what you said. Vilgefortz, Francesca, Terranova… Those who believe they have exclusive right to the force and can use it unreservedly. I wish they could listen to the little wise ugly one from Melitele’s Temple. Don’t worry, Ciri. It’s a good thing you’re thinking about it but believe me, there is enough force. It won’t run out. It’s as if you picked one single little cherry from a huge orchard.”

Note however that attempting to use more energy than the magician has drawn from the force may take it out on their own body:

“You focus yourself quickly. Let me remind you: control the flow of the force. You can only emit as much as you draw. If you release even a tiny bit more, you do so at the cost of your constitution. An effort like that could render you unconscious and, in extreme circumstances, could even kill you.

This is alluded to in the scene in the show where Tissaia is teaching the novitiates to levitate a rock, drawing energy from a nearby flower. When Fringilla overexerts herself in an uncontrolled fashion, the energy is instead drawn from her left hand, crippling it.


I've only watched the Netflix series to date, but supposing Napoleon's comment is right:

I can only comment on what I know from the books, but there the mages actually draw energy from their surroundings, specifically the elements. And the prevalent attitude seems to be that there's generally enough of it around.

– Napoleon Wilson

I would hazard that the answer is in the "controlling and shaping chaos" part. If magic is a bike, then the flower is the training wheels. It is there to absorb the improperly controlled chaos and its consequences. As such the rock levitation lesson is about learning to sense and control the chaos without getting hurt, just as training wheels help you learn to balance and steer a bike without so much risk of falling over. Once they can do that properly, the training wheels can be removed, and the bike ridden and manipulated directly and safely.

For another analogy, the side effects are like pollution from the magic factory. By default, that pollution is poured out where it's made, directly into the mage. But with training you can learn to reduce it and pipe it away. Do it right and you won't see anything bad happen at all.

This possibly ties in quite nicely into Filavandrel's accusations that humans have polluted Chaos and synthetically generated it. The synthetic generation is presumably a reference to Aretuza's eels, and possibly other similar locations and methods. But the pollution claim may be almost spot on with the above analogy: rather than try to achieve some balance via naturalistic magics, they simply learned to dilute the negative effects and shunt them away. Geralt says Chaos hasn't changed any and the humans just adapted better: the eels and "pollution" may seem unnatural to Elves but it's not changing anything about how the world works, it's just making use of how that world works in a clever way.

The main shortcoming of this theory: why does the enchanter/surgeon still caution Yennefer that all magic comes with a cost before enchanting her? He's a mage, highly skilled in his particular craft, why doesn't he just shunt this "cost-pollution" away? The best I can say to this is to refer to something Geralt says during the dragon hunt

The people who made us, they made us sterile for a lot of reasons. One of the kinder ones is because this life isn’t suited to a child.

So the sterility isn't there for a single purpose. It serves many purposes. Possibly this particular magic of enchanting is so intense or complicated that there's no simple way of getting around a sacrifice. But why it must be a sacrifice of her uterus isn't limited to, or even derived, just from the enchanting's strict requirements. Methods of control and constrained loyalties are implied by Geralt to be the less kind reasons: loyalty to family would get in the way of loyalty to the order, caring for children would get in the way of performing your duties, etc. As such sacrificing the womb may not be strictly necessary, but it is sufficient. Yennefer also says during the Djinn storyline that she did not understand what that would really mean to her later. So she may have simply accepted the requested cost of her womb and fertility because she knew there had to be some cost, and at the time that seemed acceptable. Power, recognition, beauty, going to Aedirn instead of Nilfgaard as she desired, etc. Those are the things she valued then and got in exchange. It wasn't until later that she grew disillusioned with being a court mage and attributed value to motherhood, and suddenly what she sacrificed seemed greater than what she gained.

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