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Source: https://writers.stackexchange.com/q/28645
License name: CC BY-SA 3.0
License URL: https://creativecommons.org/licenses/by-sa/3.0/

I'm writing a story where a secondary story-line (it's about a companion of the main character) is basically about a fire mage and an ice mage.  
It fits well in the story and the fire/ice elements aren't coming out of nowhere, but I wonder if it will bother the reader?  
Does it depend on whether I write it well? Or is it better that I change the elements anyway?

This is a [hard-fantasy](https://en.wikipedia.org/wiki/Hard_fantasy) story. The main character has two companions. One of them was born in a family proficient in the use of explosions, which I basically call fire magic. His father died as a rebel fighting a party of loyal soldiers (including a renowned ice user) who were killed in the process. Said ice user's son will seek revenge on the explosions user's son. This isn't the main plot, but it plays an important role nevertheless.  
According to my calculations, I'm in for one thousand pages, so of course there's much more to the story, BUT I wouldn't want that to discourage the reader from reading further...

As for what different magic types there are: actually, I at least have psychological magic, body transformations (includes healing), explosions, moving objects, heating, cooling, etc.  
Ice is moving objects + cooling at least.  
Fire is explosions + heating at least.

Original score: 7