system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] can someone explain the reality stone to me?

I don’t quite get what the reality stone is capable of. Sometimes it seems like it’s just changing an image to trick your mind, but at times it seems like it’s actually altering reality?

Thanos uses it to paint a picture of what Titan used to look like. What gets me the most is he just turned the guardians into spaghetti while they are fighting on nowhere. Were they actually dismembered like that? Was it all just a mind trick? How did they come back to normal afterwards?

The reality stone just seems very broad and extremely OP. Why didn’t he just do the same thing to all of his enemies?
gpt
The effects are real; you can't just make someone *think* the knife they just stabbed themselves with has become bubbles so they don't die.

But it seems to require either active concentration on his part, or have a limited range. The Guardians recover as soon as he leaves, and Quill's gun works normally later in the movie. The villain's plan in Thor 2 also required it to be used in a specific time and place, to start some kind of chain reaction.

So, like all the stones, immensely powerful but not limitless. Only working in tandem are they capable of changing things on a universal scale.