Warmth Bubble is a spell on the border of Pyromancy and Aeromancy. It creates an air bubble around the caster and heats the air inside it. It is common to see people walking with those bubbles around them during winter in the colder parts of the world.
Calidum Aerem Sphaera
The warmth generate by the bubble is around the average room temperature of 20 degrees Celsius. As the result, it is very common in winter to see people walking outside in spring or summer clothes with just the bubble to keep them warm.
The only known side effect of the spell is a potential cold or other similar sickness. It can happen as the result of a sudden stop of the spell when the caster is just wearing light clothes and outside temperature is low. In extreme cases, when the caster is unable to quickly recreate the bubble or hide inside hypothermia or frostbite might appear. However, these are very rare situations.
When created the air bubble can seen as delicate yellow light surrounding the caster. That light doesn't impact visibility and has no negative effect on the eyes. Some people say that it is pure magical energy.
I like the simple mechanics behind the idea and the fact that it makes me ask various questions about how it works in Magic Earth. It opens excellent possibilities for character interaction — adding a person to their bubble when they get cold, kind of similar to the "sharing an umbrella" trope. Is it known when the spell was discovered/created? More or less. Did people use winter clothes more often before that or were there other warming spells? Suppose people were walking the Krakowskie Przedmieście in Warsaw, how common the sight of the warmth bubble be? I'm also curious about whether the spell is more often used by younger/older people or if is it independent of age? The article gave me a lot of material to think about! Thank you for a good read!
I haven't thought about, but probably there could be a possibility of joining bubbles when two people are close enough to each other. I guess it would be hard not to see the bubbles on Krakowskie Przedmieście :)