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Is this trope about Doomsday Devices that were made for no good reason, or specifically about Doomsday Devices that were left behind by Precursors of some sort, and which might or might not have been made for no good reason? The examples seem like a mix of the two.
If it's the latter, I think a renaming is in order. If it's the former, the description needs a near-complete revamp.
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How well does it match the trope?