I noticed this question :
Which seems to be asking for examples in fiction of things that would be like a magical nuke. I noticed this question was also asked on SFF SE, and it was closed there, but here so far it's remained open, and I can't really think of a good close reason.
Keep in mind that this is not a 'how can I do this' question, which is a different issue. This is specifically a 'give me a list of precedents' question. I don't think we have these too often, but while I don't know exactly what to do with them by looking at the answers they don't seem like the best questions to keep around.