@Ohvist  
Oh, man. I’ve read that bit of fanfiction before, but only once. The emotional impact almost made me nauseous.

If Cozy Glow continues on her current path, the light in Equestria and beyond will stay as bright as ever. But if her heart is pained by magic, her happiness will turn to rage, and all of Equestria will crumble.
 

 
“…I’m sorry, Cozy. But I can’t just risk having one pony to have a happy life if they become a threat against Equestria. Especially if they have abilities like yours. The magic you could cause if you turned evil would destroy Equestria, which is why I have to do this…”
 
“P…P….Please, mommy. Please…don’t do this…”
 
“..So your saying, that even though I banished your aunt to the moon to protect Equestria, you’re saying that if it happens to you, you’re pleading for it not to be this way? You thought that banishing your aunt to protect Equestria was a right thing for me to do…”
 
“Well…I…”
 
“You don’t really care about Equestria do you? You didn’t have any objections when I told you I banished my sister to the moon. And to think, your aunt spent a thousand years alone and isolated, and I felt like I lost her forever, but it was the right thing to do. If you really care about Equestria, then why are you having objections right now to when I’m doing the right thing?”
 
“I love Equestria! I really care about the kingdom! But why would you do this?”
 
“I explained many times already. And I’m afraid there’s more than that. That spell also wiped out everypony’s memory that you ever existed. History books, certificates of identification, gifts that you gave to your friends, everypony! You and I are the only one’s who know of your existence. Luna won’t find out, and nopony else ever would either. This prophecy said that it is just a chance, but it’s not a chance I’m willing to take.”
 
“If you only wanted to take my magic to protect Equestria, I can get that. But you never said I would no longer be your daughter!”
 
“I would believe in a prophecy more than you if it means to protect Equestria. I’ve fought enough villains during my time. Nightmare moon is returning the day after tomorrow, and I’m not letting any new threat to Equestria emerge to ruin a era of peace that I can have with my sister. You no longer live with me in Canterlot, and starting from when the sun sets today, I banish you from Canterlot forever. I can’t have you using any secret books or passages in Canterlot to prove that you are my daughter.”
 
“Where will I go? Can I ever at least see you again?”
 
“I’m afraid not. I’m sorry Cozy. I really am. But a real Princess would never take even the smallest chance when it comes to one pony and her kingdom. Not even for her own daughter.”
 
“But a mother would.”
 

 
“Today is the first day I have to spend without my daughter. I immediately regret my decision of betraying her. Now I realized that when her heart would be pained by magic, it wasn’t talking about Cozy’s magic, it was talking about the Element of Magic. How did I not think of it before? I used the Elements of Harmony against my own daughter! That was the only time her heart was ever pained! I’m the one who would fulfill the prophecy! But now it’s too late. Cozy is gone. The difference between Luna’s banishment and Cozy’s banishment is that I fully knew that Luna was evil, and there weren’t any chances. I already knew for sure that she turned evil. Cozy, on the other hoof, I was so paranoid into thinking this prophecy was going to come true, I didn’t think about self-fulfilling and I ended up being the one to pain her heart using magic. What have I done? …But, now I don’t think I have the strength to find Cozy. I’m scared of how she would react. I shouldn’t bother to find her. I don’t want to see how she’d react at my betrayal. I know that missing my daughter will be hard, but it’s best if I don’t bother to show up. Maybe she’ll just get less angry over time. But in the meantime, I have my sister, and I have a student who’s exactly like my daughter, so it wouldn’t feel like I’m missing anypony in my life at all…”
 

 
“You have destroyed my heart, Mother. And now, you will pay.”

the best ending is the harem ending

@Stellarator  
This is the good ending.

Oh. Oh. This is The Bad Ending.

Amazing!

where’s pony horus when you need him

cool

Okay, now this is epic

Long live the Empress

Adult Queen Cozy Glow?
 
“Instead of a Dark Lord, you would have a queen, not dark but beautiful and terrible as the dawn! Tempestuous as the sea, and stronger than the foundations of the earth! All shall love me and despair!”

The Empress of Friendship.
 
“Oh Golly has Tirek bully you again? I will talk to him, I mean what are Friends for. Surely we get some of your magic back so you can work again.”

Yes, Cozy Glow might have quelled the rebellion to her rule. But when the land is devoid of magic essential to its development, and not even Cozy Glow can reclaim it… is it a rule worth claiming?