Bro, I can tell you with 90% certainty Skybreaker and the lore surrounding it will be irrelevant in the aftermath of this event. Even if Marvel keeps exploiting T'Challa and his world to keep Storm relevant most of the crap the writer wrote will be forgotten. She didn't contribute anything to the mythos and I strongly doubt a future BP writer will try to make sense of this issue.
That said, I don't think Vita was saying the vibranium came from a supernova, but rather a meteorite from a planet destroyed by a supernova struck the vibranium already in the Great Mound and purified it, imbuing it with strange properties. So the same mountain got hit with two different meteorites apparently. And the sword created from it is the basis of Wakandan ingenuity. Vita should never be allowed to write another BP book lol.
That's not the origin of vibranium, we don't get that in the issue. But if it were, it's just about the laziest possible explanation for where it comes from. A planet blew up and it crashed into Wakanda? If the origin of vibranium didn't include gods, past universes, and ancient prophecies I'd be utterly disappointed. Which is why I'm thankful Coates or Vita didn't get to tell it.
Coates would say it was a chunk of a planet that broke off due to lesbian black slave labor and it was T'challa's future self that went in the past that caused it so it is T'challa's fault and it can only be fixed if Storm fuses with the M'kran crystal while the Midnight Angels pray to her and T'challa lets Changamire stabs his heart with a sharpened Wakanda history tablet that Griot Shuri made from memory while Eden teleports them there without saying a word.
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The sad/funny part is this origin contradicts the entire premise of The Galactic Empire. Tchalla sent them to space to look for the path the Vb meteor took. But according to the Xoffice it was never there in the first place. Even if you find remnants of the same planet, you still need Vb to irradiate. Lol.
So the movie ripped up Coates's first arc, and Vita ripped up arcs 2 &3? Might have to sent the Xoffice a nice fruit basket. Lol.
I say the vibranium was planted by an elder of the universe for his solar system destroying cosmic concerts.
Reality is for those who are afraid of science fiction.