Favorite execute ability?

By execute, I mean this: - Any ability that has %missing health scaling to it - for example, Garen's R, Lee Sin's Q, Elise(spider form) Q - Any ability that **is best used when target is low on health in general or was in long combat but deals flat damage** - like Darius R, Riven's R, Chogath's R, Karthus R Let me know in the comments!
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