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Is there a trope for when there a super powerful weapon or item that almost to strong for characters to stop. But then in the end the item is revealed just to be someone else child toy or just a back scratcher

I don't know if either of these are tropes, if they are I can't find them, but if they're not, I feel like they probably should be. They're everywhere.

Firstly, when an innocent kid gets sucked into a new bad-influence peer group (a clique or a gang, both work), abandoning/betraying his existing friends in the process.

And secondly, when an external force besieges a location, possibly a town, building, or planet, doesn't matter, and demands that the inhabitants turn over one of the people inside or all of them will be killed. Usually the dilemma is that the inhabitants know both that the person in question is pretty much innocent and that if he is sent out he will probably be killed/tortured/etc.

Anyway, I have no idea what these tropes are or if they even exist yet.

EDIT: Oops, the Lost and Found page is hard to navigate and I thought this is where you were supposed to post.

Whats the name of a trope where someones daughter is offered to the hero of a story? Like in the original Stargate movie, where Daniel is offered the tribe leader's daughter, or a more recent example in the Book of Eli, where the Gary Oldman sends Mila Kunis's character to Denzel Washington's character to try and convince Denzel's character to do something.