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1. The item might not be a MacGuffin since the object does things within the story (i.e., the villain or hero uses it).
2. That's the one. Thank you.
Edited by EmeraldSky
1 is Wrecked Weapon
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No Man Should Have This Power covers when the hero intentionally destroys the weapon because it's too dangerous. (And the corner case where the weapon accidentally gets destroyed, but the hero isn't bothered by this because it was too dangerous anyway.)
First, I'm looking for two similar but distinct tropes.
1. After a climactic battle, the heroes get the dangerous Legendary Weapon away from the villain, only to find it was accidentally broken during the fight.
2. After a climactic battle, the heroes get the dangerous Legendary Weapon away from the villain. They intentionally destroy it so no one else can use its power since it is so dangerous.
This is less about the "weapon" itself (it could be a Legendary Weapon, an Artifact of Doom, a Fantastic Nuke, etc.) and more about it being used and then destroyed in the end: accidentally in one case, purposely in the other.
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The other trope I'm looking for is the opposite of The Magic Goes Away, where instead of leaving, magic or other superpowers start appearing in the world. Appearing, not reappearing. So it's not The Magic Comes Back because there were no powers or magic before this point. It's like in My Hero Academia when superpowers started showing up years before the storyline began.
Edit: Ignore that last one. I found it. It's The Magic Comes Back, Subverted.
Edited by EmeraldSky