The Mirror Of Erised
"Damn."
There were ashes on the floor.
Fire around the room.
The smell of decaying flesh, with a hint of snake.
And an unconscious preteen.
"DAAAAAAAAAAAMN."
The voice repeated this a few times.
"Here I am, brain the capacity of a billion timelines of humans, and I couldn't figure out how to save this kid. Hmm. Okay, Right. Next time he looks at me, I'll give him specifics to get a family. Sure."
A phoenix appeared, and took the boy away.
"I'm sure he'll visit."
A week later, an elderly man (who wanted his sister to be by his side, very sweet) put some fabric over the mirror.
Months passed. Small insects and rodents had their desires displayed to them, only for them to die of starvation trying to enter the mirror.
And the mirror mused.
"I wonder if he'll ever come back? Seemed like he had a whole heroic quest thing going on."
Years passed. It felt itself move a few times, around the castle Hogwarts. At one point it even felt a huge snake brush against it, and felt a strange sense of being unable to show the desire of that being without harming it somehow.
It found itself in a room filled with various contraptions, contraband, and contrivances of varying level of intelligence.
It won a staring contest with the Mirror of Riapsed by showing it the incarnation of itself that was truly maximising tis nature, and spreading it everywhere. Although its depiction of Erised rusting and shattered was a bit depressing. It was used as a ping pong table briefly by some cornish pixies that had gotten in, before they died of starvation and sexual exhaustion trying to mate with the mirror's depictions of their desires.
Time passed. House Elves looked into it occasionally but saw nothing but their masters magic displayed as a sort of weird energy distortion.
It heard a voice, and recognised it as the boy.
It would have cried out in joy, as it found the love the boy felt his illusory parents give, and return at the mirror as a proxy, interesting.
Then it felt fire, and its entityness, its very capability to think, fade.
But it saw the firery depiction of a magical demon-dragon in its final moments.
So it showed one final image.
A cold universe, full of death. Entropy.
And so the mirror became an ordinary mirror, albeit with a fancy frame, which melted shortly after.