Scorpan was interested in visiting a continent unknown to him and he invited his older sister, Lady Tirek, to go with him. She agrees and they go to the continent.  This is happening at a time when Luna has not yet been banished on the moon and Celestia and Luna are not yet so experienced rulers in every respect.

The local inhabitants are suspicious because these two are completely alien to them. Scorpan develops a positive relationship with them. Lady Tirek is also trying to make friends, but her slightly intimidating appearance makes her harder. However, one female pony is not afraid of it, on the contrary. She ignores the warnings of others (their warnings are unfounded. As these two gave them no reason to be afraid, quite the opposite). This female pony is the first to talk to Lady Tirek. Thanks to this, the rest of them convince themselves of her. However, Lady Tirek's relationship with a female pony is more unique.

An: Here, come up with a name for the female pony as well as her appearance etc.

Several months pass. Lady Tirek and the female pony are in a clearing with one tree isolated from the rest. These two sleep comfortably in each other's arms (they are a couple). They were having a nice picnic right now and they fell asleep.

They will be awakened by a few soldiers who have started to shackle the lady's tire. A female ponytail was being pulled brutally to the side.
a) Scorpan has always been jealous and envious of the very existence of his sister. He was also a master of manipulation and lies, so he easily convinced the princesses that Lady Tirek had bad intentions and even showed some fabricated evidence. Celestia and Lunia did not have the experience that they can now be manipulated.
Lady Tirek herself was aware that her brother was a bit of a manipulator, but did not suspect him of wanting to kill his own sister.

When Lady Tirek noticed this, she began to pose. Celestia, still remembering the gruesome evidence, decided to remove the threat. She charged her horn to kill. At the last moment, a female pony covered her beloved with her own body, receiving critical injuries. Lady Tirek will tearfully plead with her not to leave. The female pony admits it was a wonderful time and then she is gone.

A few minutes later most of the soldiers were rendered unconscious or killed. Lady Tirek was badly injured and at the mercy of Celestia. Although she planned to kill her, she decided to imprison her in Tartarus.

During a clash with the spirit of chaos. He himself will utterly seriously and even repulsively utter enigmatic words, the meaning of which Celestia does not yet understand.

In any case, a few years after Luna's banishment to the moon, Celestia herself will finally have a revelation to these enigmatic words and the consequences of what she did then. She was terrified to be manipulated to kill.

Though the murder of Celestia is a terrible thing, she has committed even more terrible crimes. Killing one of the two people who were bound by the bond of the soul (love stronger than ordinary and rare) is even worse. No madman or sombra, spirit of chaos, etc., despite his cruel deeds, have not descended to such a thing. The towers of the soul can be felt without any problem. If, for example, Sombra sensed it, he would not kill such people. Despite the desire to kill the innocent, he does not want to fall so low.

Celestia had regularly suffered from nightmares and guilt for thousands of years. Though she wanted to speak to Lady Tirek, she did not dare. When Luna returns, she will regularly remove her sister's nightmares. For a short while, Celestia can sleep peacefully, but after a while the nightmare of dreams will return.

When the spirit of chaos returns, he will point out Celestia's mistake again (Although he likes to be malicious, he is actually extremely serious then. Despite the passage of years, he is still disgusted by her). Celestia will tremble with guilt, etc. Even if her student wants to find out what's going on, the master will refuse.

They are not aware that Lady Tirek escaped from prison some 300 years ago. During this time, she wandered around the world looking for the right person, whose power she would absorb. If it consumes a supply of magical energy yes then its magical reserves are temporarily increased but not increased. And the individuals themselves only feel tired, and it is enough for them to sleep for one day and their magical reserves of magic will return to normal. If it absorbs the supply of magical energy in any other way, then its magical reserves are constantly strengthened and increased. The victims then die.

For a long time she was looking for people who had suffered from poisoning with magical energy from birth. It is a painful and slow death, and no magic or medicine can do anything. Then she comes to such people and they talk happily. If such a person is fully ready to give up his life because they think that further existence is too painful, then he proceeds to it (point a). This is not a murder, but mercy, because I am asking myself for the sick to end this pain.

Lady Tirek returns to her previous form after many years when she first appeared on this continent. He carefully exhausts the magical supplies of the various ponies, and before he moves to another place, he makes sure that the next day they return to full strength.

Luna and Celestia had had the same vision before. Celestia has forbidden any involvement in this or sending a spirit of chaos. Nobody died and the ponies were healthy. Accidental victims who have suffered from magic poisoning are also disregarded. Celestia herself also believed that it would be merciful to give such individuals eternal sleep, but no one had the courage or strong will to do so.

Lady Tirek finally enters the throne room where Celestia, Luna, Cadence, Twilight sparkle are waiting. The other two came despite being forbidden to engage in it.

Lady Tirek quickly immobilizes everyone except Celestia. She can finally avenge her love. After a short fight (Celestia did not fight seriously. Not out of superiority, she just couldn't). Lady Tirek uses her hands instead of magic and begins to choke the sun queen.

Celestia will summon a small crystal before losing consciousness. Lady Tirek will quickly realize it has the soul of her love. For a moment it loses concentration, which causes the rest to fall to the ground and release the grip on Celestio's neck. She recognizes this and when she realizes what Celestia has done, she will get furious. He will choke again with even more force.

an: When you summon the souls of the deceased to the material world, then such a soul is damned forever.

Celestia explains at the last moment that her beloved's soul was drifting between the worlds of the living and the dead. The soul would not go back to Lady Tirek. For many centuries, Celestia studied this magic, etc., until she finally succeeded. Now all you have to do is create a soul vessel.

Lady Tirek gave her a suffocate for a moment, but she took her word for it. People before death are always honest. He will release her and gently take the crystal. Lady Tirek will run away with the crystal far away. The crisis was over, but Celestia's guilt was still there.

A few years later, Celestia finds Lady Tirek, who has been working tirelessly to create the vessel. Despite her aversion to Celestia, she agrees to help. Together, they make a faithful copy of the previous body of the female pony and put their soul into it. It all worked out.

Years later, Lady Tirek discovered the truth behind the plot many centuries ago. She couldn't believe that her own brother, whom she loved, wanted her undoing. Though Celestia did what she did, she suffered from it. During the festival of the sun, Lady Tirek and her love come. Celestia and Lady Tirek are talking privately. She forgives Celestia for past deeds. Lady Tirek is also aware that Celestia sacrificed her immortality to summon this one soul. Celestia herself will start crying with relief. Finally, after so many painful years, she corrected her mistakes.

An: I can't remember who ask me to create this so please comment.