I will be secure in my superiority. Therefore, I will feel no need to prove it by leaving clues in the form of riddles or leaving my weaker enemies alive to show they pose no threat.
Obviously, flaunting your superiority in this way is part of the fun of the job, so it's something a lot of attempted overlords do. It's important to resist the temptation and realize that these kinds of actions can come back to haunt you at some time in the future.
The Master of leaving riddles has never even beaten his foe; at least not permanently, even if temporarily. Be smarter and better than these kinds of villains, and don't let your ego get in the way of doing what you must to complete your domination. Once you're actually secure in your position as ruler of the world, you can have all the ego you want.
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