system
Given the following post, respond as if you're commenting on Reddit:
human
[Dungeons & Dragons] Why do wishes always go wrong?

Everyone knows not to trust supernatural beings who offer to make wishes come true. Genies and devils always try to trick you, and resolve wishes in the most ironic and rat-bastardly way possible. But what about spellcasters who cast their own wishes? Why do they need to be so careful and constantly worry that their intention will be interpreted not only literally, but twisted into the worst possible outcome? Why is it that such a powerful spell is apparently self-aware, and a real jerkass to boot?
gpt
They don't. any good 18+level wizard knows the exact limitations of a wish spell it can give you money; 25,000 gp to be exact, power; any of your natural abilities can be raised by 10% of the human average; you can cast any spell less powerful than wish even if you couldn't normally cast it (for example because you don't have it prepared or aren't the correct class); or it can make you and one other being move to any place of your choosing regardless of distance. there are a few other things it can do that require the wizard to sacrifice a portion of their life essence like raise the dead or turn back time.

What you are unknowingly asking about is why people that try to bend the rules of wishing often come to such awful fates. well mostly it is because people who are in tune with magic are often negatively affected when magic is strained and casting wish without obeying the rules does just that. the links the wizard has to the world and magic don't weaken, they warp becoming channels for destruction and suffering.