u/Parysian

That's right motherfucker, I've put on my "more creative than you" hat once more to deliver a devastating cold iron (which is used *by* fey *against* humanoids in my setting) nail into the coffin of your inferior worldbuilding chops. Hold onto your boyshorts for this one because it's gonna be a bumpy ride.

What if things that are usually bad, were different, in a way that removes the part that makes them bad? What then, huh? Ever think of that? I bet you hadn't. Let me 'splain it to you.

How about a lich, whose phylactery is fed by sunshine and rainbows instead of people's souls. Getting the concept? Instead of a mortal who has achieved immortality and powers beyond comprehension at the cost of throwing away everything that makes them human, they were just an ugly wizard who lives forever? Isn't that so much more compelling? Doesn't that subvert your precious tropes into the dirt?

What about a mind flayer that doesn't flay minds, but instead just sort of hangs out, and is basically just a dude that happens to have a squid face. And no, before you ask, they don't reproduce by putting a larva in someone's head and eating their brain from the inside, they just have (enthusiastically) consensual sex with each other. Imagine all the possibilities of a guy with tentacles on his face who is otherwise just a human. You could write a whole campaign on such an interesting concept.

Consider another thing that ignorant "worldbuilders" assume is always intrinsically evil: racialized chattel slavery. With a simple subversion of tropes, you could take this thing all of your players will assume is bad, and wow them with the plot twist that it's actually good! Perhaps the "slave race" actually loves being slaves and don't even know what to do with themselves when you free them. Maybe there are a few that want to be free, but that's considered a form of deviance and mental illness. For more on this, check out my longform content at https://www.dailywire.com/show/the-matt-walsh-show

But there's more. Imagine a world where necromancy wasn't seen as bad, because everyone loves it when you dig up their grandparents' bodies and use them as meat puppets, and think it's neat. Honestly you could use their rotting corpses for food production and as far as I can tell basically nothing would go wrong. Necromancers will go from an evil enemy the PCs are expected to fight, to a beloved community servant who puts your farm out of the job by turning your ancestors' bones into their puppets.

These are just a taste of the wonders of creative and subversive worldbuilding you can achieve if you take something that's normally bad, remove the part that makes it bad, and then say it's good. Your players will bow to your superior creativity and beg you to start a second campaign on thursdays so they can participate in it instead of watching the inferior Critical Roll season whatever the fuck they're on right now.