"...Very well. I forfeit my life."
Alex knew the best for everyone would be for her to die. This seemed like the best option, everyone would survive, she wouldn't be controlled by Validar any longer. This was the best option.
"Do what you must."
"Godspeed, Alex." Lucina said, after a moment of hesitation from her. Time seemed to slow down now, but at the same time everything sped up. Alex took in the last things she'd see in her life. The beautiful sunset, Lucina and how such a beautiful young woman she had become from the tiny little baby back in Ylisstol, she took in the breeze and how nice it felt.
She didn't want to die, but this was for the best. She was terrified, she didn't want to leave her friends, the Shepherds, Chrom especially. But this had to be done.
"STOP!" Came a voice, but the events were already going much too fast for it to stop.
The blade pierced through Alex easily, straight through her heart. There was pain, despite Lucina having told her painless, but it wasn't the girls fault. Of course having steel going through your heart would hurt. Blood started seeping out of the wound, and some escaped through her mouth. As Lucina took the sword out of her body for the wound to now bleed freely, she smiled, even though it hurt and it was hard to breathe and it was getting worse and worse. Tears fell from her eyes as she fell, but now felt peace. Everyone would now be safe. The Shepherds would be safe. The future would be safe. Most importantly, Chrom would be safe. The world went silent, and then her vision went black, her last breath exhaling out of her lungs before reaching the ground, and closed her eyes. Where ever she went now, she would know that they were all now safe from her.
"ALEX!" Chrom rushed over, and caught her falling body before it hit the ground. "Oh gods, no.. NO! ALEX! Come on, WAKE UP!" Chrom shouted urgently, and his voice started wavering and cracking the more he shouted. He knew it was pointless to do so, that she was already gone. Her body was already going cold and she did not respond at all to him. His best friend was gone, but he didn't want to believe it. Refused to believe it.
Lucina stood behind him, her sword dripping with the tacticians blood, and even a bit onto herself. She stared absently at the scene before her. Her mind couldn't process the events truly happened. Chrom didn't care about getting blood on himself, as he normally did in battle, but this was different. Much different.
It was the blood of his closest friend, the one he always depended on and trusted with his life. Even after finding out that she could be controlled by Validar, he didn't want her to leave his side, because he trusted her more than anything.
As tears came out of Chrom's eyes, as he continued to shout and hold the limp body closely, his voice now going hoarse, Lucina finally processed what happened as she looked down at her bloodied hand. "Oh gods.." She muttered, and shook her head. "What... h-have I done..?" Maybe it was for the best, maybe this was would save the future, and make everything better.
But it didn't feel like it at all.
A slight breeze swept through the golden fields of sunset, as tears finally came from Lucina, and she knew she'd never be able to forgive herself. She dropped Falchion and collapsed to her knees, sobbing uncontrollably now. "F-father, I.." she choked, shaking her head. Chrom looked over at his daughter, still holding the lifeless body. He heard the whole conversation before this all happened, and knew his daughters heart was in the right place as she was only trying to do what was best, but he knew there could have been another way. She knew that now too.
Wanting two of the most important people in his world next to him, Chrom grabbed Lucina, much to her surprise, and pulled her over. He wrapped an arm tightly around her, having rested Alex's head now on his lap, and gripping her hand tightly with his. Lucina cried into her fathers shoulder, making incoherent phrases as she tried to apologize.
"I-it's okay, L-Lucina.." Chrom choked, quickly kissing his daughters forehead and held her tightly, as if he was about to lose her next.
After a while, Chrom carried Alex's body back to the other Shepherds. All sobbed heavily when they realized the bloody woman was in fact dead, and not only wounded. Lissa hugged her brother tightly, sobbing into him as he hugged and comforted his sister. Lissa and Alex had been like sisters, and losing her so close to losing their older sister only reopened their wounds. Sully cursed, and had to be held by Vaike and Stahl to keep from breaking anything as the three of them cried. Frederick didn't know how to react, as he had been wary of Alex, but never thought this sort of thing would happen. He stayed strong for the two royal siblings, not daring to cry one tear. Lucina kept her distance from the others.
However, no one could find Morgan, which rose some panic in the group, and made everyone realize this was real, there was no undoing what had happened. Alex was gone, and now as was Morgan.
The next day, the Shepherds all agreed to at once march back to Ylisse, and give the girl a proper burial at Ylisstol. She was not of royalty, but she'd done so much for the country that it felt as if it was the right thing to do.
The war was won, after Validar failed to resurrect the fell dragon Grima, having been instantly slaughtered by the Shepherds in revenge, and the death of Alex. Peace restored as well as it could to Ylisse, as the future was saved and destiny was altered.
Even though Morgan's body was never found, there was a tombstone next to Alex's with his name, in memory of the child.