From the beginning of the first book of 魔法科高校の劣等生 (その refers to 魔法)

> 当初、その異能は「超能力」と呼ばれていた。 **純粋に先天的な、突然変異で備わる能力であって** 、共有・普及可能な技術体系化は不可能と考えられていた。

I might be overthinking but I'm not sure about で after 突然変異. I wonder
if「先天的な、突然変異で」is actually modifying 備わる because when I look up this word in a
monolingual dictionary, I noticed が is typically used like「冷暖房の備わった部屋」for
example. How will the meaning change if「先天的な、突然変異の備わる」is used?

Or maybe, the first part of the sentence is parsed like this way

> 純粋に (先天的な、突然変異 **で** ) (備わる能力 **で** ) あって

Both で goes to あって. I'm not sure if that's case because I think でも should be
used instead of で.
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question
grammar parsing
Does で goes with 備わる here?
That last であって is just
[である](https://japanese.stackexchange.com/questions/74286/language-rules-
of-%E3%81%A7%E3%81%82%E3%82%8B-beyond-simply-
replacing-%E3%81%A7%E3%81%99-%E3%81%A0) in the continuative て form and it acts
more or less like です. With this in mind, we can safely assume that the
sentence is parsed like this:

> (純粋に先天的な、突然変異で備わる **能力** )である
>
> It's purely an innate ability obtained by mutation.

In that previous sentence, the が is implicit and goes with 能力. The mutation
突然変異 is the means/method by which that ability is acquired, so it needs で. If
you change it to 突然変異の備わる能力, this would mean that the ability itself "possess"
a mutation (I'm unsure if 備わる can even be used like that in the first place).
Assuming we're talking about humans, an example with が for the same context
would be:

> その能力の備わる人間 [...]
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answer