Fire on Fire: The Phoenix

A story inspired and referenced from one of 𝙖𝙢𝙖𝙯𝙞𝙣𝙜𝗺𝗮𝗴𝗶𝗰𝙜𝙖𝙢𝙚𝘀12 oneshots.

And the alternate title of this story is "𝗣𝗵𝗼𝗲𝗻𝗶𝘅".
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An au where, after eating a strange apple and struck by a sudden lightning Fumikage Tokoyami finds himself shocked and confused, as well as his other classmates because of some newfound power.

After those 2 events Tokoyami sees more than just him and his Dark Shadow now, because of that apple and lightning there seemed to be something there that settled inside of the avian.

What was it?

What was it that made the cold air around them warm when he is there, what made some of their things crystallize and as cold as ice, what made the ground beneath them shake when he became upset, what made the waters move strangely whenever he is near them, and what made the soft breeze so hard whenever he sneezes?