There have been several questions which are in the form "I created this unstoppable ability for my bad guy, how can I defeat him?" Examples are:
- How do you defeat a time-stopping Dark Lord?
- Assassinate a semi-omniscient crime lord
- How do you assassinate someone who is protected by precognitive people?
- How to Defeat a Precognitive Warrior?
- Possible weaknesses of a vector manipulator
The general pattern for this type of question is:
- Create some vastly overpowered superpower for which you cannot find a counter
- Give it to your villain
- Ask for help on WB to find a counter.
This kind of thinking almost always has to lead to one of the following outcomes:
- A seasoned worldbuilder looks at the scenario, finds an obvious flaw and abuses it. This typically requires the OP to have taken great care to specify the power very specifically, otherwise its hard for a flaw to be obvious. Villian's ability has a 20m diameter effect? Make your weapon 21m in diameter. If brute force doesn't work, you're not using enough.
- The question is impossible to answer because the superpower is simply too powerful. If the villain has a card which says "playing this card wins the game," and they can play it at any time they please, there really isn't a way to stop them from winning, is there?
- A less-than-obvious flaw is identified and exploited to reveal a major issue with the villain's ability. This is where your clever code breakers realize there's a few "forbidden" settings in your encryption machine and leverage those to crack your code.
My opinion is that the best "unstoppable forces" have very subtle weaknesses. A great example is found in traditional stories of using magic to make people fall in love (it always fails for rather intriguing reasons). We also see great examples in war novels, fiction and non-fiction, where the constant arms war leads to exploits of very clever nuances in the enemy's implementation.
However, these also seem like they are better added by an author, not a worldbuilding poster. The key to building one of these subtle weaknesses is to carefully refine the superpower in a way which creates that weakness. As a worldbuilder, we don't always have that power... but the author does. It may take 5 or more back-and-forths to nail down what sort of adjustments are acceptable to the author. StackExchange is not built to handle back and forths.
So these questions bug me, and I'm wondering if there's anything that should be done about them. If it were up to me, I'd close almost all of them, but when I look at the questions linked above, many of them are popular. I'm clearly in the minority in disliking this sort of question. Other than the obvious solution to my problem ("just don't look at those questions, dummy!"), is there anything that can be done to help improve the quality of such questions so that they lead more towards the interesting subtle flaws?