Disclaimer: FE (c) Intelligent Systems x Nintendo. Fan writing.

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Ylisstol Streets
Krom's heart felt heavy all the sudden but he knew that he had to deal with the matter before him. Another Lucina was stuck between a rock and a hard place. In a last ditched effort, she starts fighting her way out and manages to get to where Krom was. However, when he was about to strike her down, Original Lucina deflects a nasty move Another Lucina made that had nearly hacked Krom's head off.

"Lucina."
"Stay back, Father."

Lucina could not understand why her alternate was so intent on killing Stella. Another Lucina didn't understand why a version of her was in this timeline facing off against her. Also she didn't know that this Lucina was very over powered. Mark appears next to Original Lucina who had beckoned him for help. Both only manage to take out Another Lucina's mask. Fortunately, Original Lucina had her hair up to differentiate the difference and cover the fact that they were identical people.

Another Lucina was running out of options. Krom was about to finish her, when a huge blow took him out. An older version of himself - the Krom from Another Lucina's realm had appeared. People could tell Another Krom was a tired and solemn man. When Krom recovered, Another Krom immediately forced Lucina's head down in apology.
"Sorry, me. Lucina, apologize for the problems you caused."
SLAM!
"Do you know what your lovely daughter did? Killed my wife twice." Krom angrily strangling Lucina, while demanding an answer from Another Krom.
"Stella? You still have Stella? But what do you mean "killed twice"?" Another Krom was surprised to hear this.
"You explain why, where, and what future are you from! Your daughter comes to the past on a killing spree. Stella nearly died twice from being attacked by her! Also how did you get your Falchion stolen? Your kid damaged it and we had to use it to save Stella's life."

Another Krom was quiet and then finally replied: "Please find a way to bring your Stella home. "
Another Krom started to disintegrate. "Please don't regret and bring her home.
Another Krom vanished with a smile.
"Father!" Another Lucina collapses in tears.

Krom didn't understand why a smile...to such a sad face. Another Lucina finally confessed.

"Father wandered aimlessly looking for Stella, eventually his age took a toll on him. I knew if he did find her, he would die peacefully, but I didn't want him to die so I tried to slay Grima. I messed up and caused a disaster so I aimed for the Another Stella that lived to allow Father live in the fabled outrealm."
SLAP!
Lucina was in rage mode. "Am I really that big of an IDIOT? For the sake of father, I doubted mother. I was nearly the cause of Father's sadness. You are doing the same... Mother's heart is heavily damaged, thanks to you. Tiki has to take her to a place to mend her heart."

Krom had no idea what he just heard.

"In my time, you didn't exist but maybe it will change now for the better. In my time, the Outrealm Gate will collapse causing the world to be isolated. In my time, Father regretted of letting go. In my time, I wanted to believe that I had everything but in my time, I didn't know Stella was my mother..."

On the day before the Seasonal Winds Festival, Another Lucina fades out of existence.