https://www.youtube.com/watch?v=FtciOwheHFo

Celestia stood in front of the glass case in the artifact room. She stared at the red shards of the Siren jewels and sighed. How could she have missed that one shard? How could she? Now her daughter was one of the worst creatures in all of the universe. The consequences, she knew, were to be severe.

How was it that things always went wrong with those she cared for? Like her sister. Luna had become a deranged monster and she had had to banish her to the moon. It was not easy to send away someone she cared for. It was bad enough that she was immortal. Being immortal had its own casualties. Like watching loved ones grow old and die. Great heroes and legends of Equestria had lived to their full potential and eventually passed away. And Celestia couldn't do a thing about it.

She frowned as she looked at the bewitched treasure. This was terrible.

There had to be a way to get rid of the magic inside these shards. But how? Starswirl the Bearded once made a theory that destroying one of the shards magical properties destroyed all of the other pieces' power. But if she did get rid of the power inside one, it wouldn't do anything but cause problems. Why? Because Sunset still had one of the pieces that made her a Siren.

And what happens to a Siren when they lose power in their jewel?

They die.

She can't have Sunset die. That was her daughter and Twilight's beloved(and not to mention the main character of this series*cough, cough* We wouldn't want that now would we.) Celestia thought harder on the situation. How could she remove the shard from Sunset? It wasn't at all visible like that of a regular Siren's jewel. It was somewhere within the girl's being...

She could perform major surgery.

But that's stupid. Why would she cut her open if she had no idea where it was inside her?

She'd definitely have to use magic to remove it from her...Celestia needed answers. But there weren't any to her problem. She moved away from the case and glanced at the case that held the vial of dark magic that Sunset had poisoned the crown with.

Wait.

Poison.

An idea ran through her head. If she were to poison the jewel shards with the dark magic, the fragment inside Sunset would be poisoned as well since whatever happened to one happened to all, in theory. Celestia was able to remove evil magic from objects with her alicorn magic. If she were to remove the now corrupted magic from the shard, she could take away its power without discarding the fragment inside Sunset. And there won't be a chance she would die without the magic because the power of the jewel itself would not be destroyed, only removed. And Celestia would transfer the magic back inside the vial...

The princess looked at the vial.

This seemed like the solution. But poisoning it...

Sunset could become extremely ill during the process and even...

Celestia flinched at the thought of her lying on the ground staring up at the sky, unblinking. Twilight would fall to her knees and cry herself to death, forever scared by her dearest before her. Lifeless. A burial would take place and white flowers as pure as the love Sunset and Twilight shared would lay on her grave. They would be a bright beacon of light on a day so dark...

A twinge in Celestia's heart came and she looked down at her hooves.

This seemed like the only possible way to rid the girl of her cursed identity. But it could also rid the girl herself. Thinking of all the times she had witnessed the deaths of fallen heroes and those close to her like Clover the Clever, Starswirl the Bearded, even her own parents...It all was so sad. The only difference was that it would be her fault if Sunset were to die.

She had to tell Twilight about this. But she knew she would never allow that. Not if it harmed her. Twilight would fight her way around it, looking desperately for a way to go about removing the charm without her being hurt. But somehow, Celestia had the feeling that this was the only way.

The vial waited before her, a cure and a poison at the same time. A cure to Sunset's Siren problem. A poison in itself. It was a choice between fates. Either she took the vial and chanced the death of her daughter for the riddance of a creature, or she leave the vial and let Sunset deal with a life of hell.

Why was this such a big deal, you ask. Why can't Celestia just leave Sunset as a Siren? Well, it isn't as simple as what you may think. Sirens, as you know, devour souls and emotions from others around them. From what Celestia knew, the Dazzlings devoured emotions of rage. But there was something she knew that no one else did...

It was centuries ago.

Long before the time of Luna's Banishment. Way back when Sirens were first being discovered. It was around 610 B.L. A mare had seen a group of sailors arguing over a fractured jewel. A part of it attached itself to her and she became known as the Demi-Siren. An old ponylore is what everyone thought then. But one night when Celestia was out strolling her gardens, she saw her.

A magnificent creature of gold and white. Wings as large as a dragon's and dark eyes like those of an eagle, she knew it was the mare by the sea. She had a pony's body, but it was tall and long like hers. With a tail of a snake and the mane of a lion, the Siren sat upon the hedges and before her was a stallion. He stood before her entranced.

He was a fine breed of horse, with a thick coat and healthy body. Celestia stood there, shocked by the presence of the Siren and colt. If she moved in to save him, she wouldn't know the knowledge she possessed to this day. It was an odd sight to see this bizarre creature there with him. Out of no where, the Siren leaned forward and kissed the stallion. Almost immediately the color ran out of him and he stood there stiffly.

A bright and ghostly figure came up from the stallion and the Siren absorbed it greedily. When she pulled away, the stallion fell dead on his side. It was such a shock to Celestia that she couldn't move from fear and surprise. The Demi-Siren flew away and was never seen again by Celestia. She had the stallion's body taken in and identified. The colt that had died was the used-to-be mare's fiancé.

The next morning, six dead bodies were reported to her. All of them were in close relation to the mare. They were all her family. Even a small foal died that day. Celestia had Starswirl track the demon through the trail of bodies and he discovered that the victims were all people the mare cared for.

Later, forward a few hundred years, four cases of Demi-Sirens were reported. And all of them had one type of victim. Their loved ones. They fed on the souls of those that they loved and took strength from their love.

Celestia stared at the vial.

If she were to let the cursed fragment root itself within Sunset, there would be a great deal of death. And the first victim would undoubtedly be Twilight Sparkle. She couldn't let that happen. Her only option was to take the vial and poison the jewel.

But she had to do it without either of them knowing.

It was painful that she had to do this, but she had no choice.

Celestia walked toward the glass case and opened it. Taking out the poison, she glanced at the shards.

Author's Notes:

This randomly popped inside my head. For the longest time, I wasn't sure how they would get the Siren out of Sunset. Well bam! My mind works wonders, folks!