Robin woke up to Chrom desperate shouting at can feel the pain through out his entire body from exhausting too much from both physical and magical attack he sustained.
He can hear the cries of people dying from his surrounding as he struggles to pull himself up.
Chrom sees his friend is struggling thus he lends out his hand and pull Robin up. He handles Robin to Lucina standing next to him as he said with sadness in his eyes.
"Go!"
"But father..." Lucina tries to argue but Chrom put his hand on her shoulder and calmly says "We will at least have a fighting chance if you take Robin with you, we will buy you some time to escape." Turning his back as he raises his sword the Falchion to shout his last command to the shepherds.
"For Ylisse! For our future!" He and his generation of shepherds charged ahead against the fell dragon, Grima.
The scenes changed 6 months later as the last remaining warriors ready for their last stand.
"Lucina please, we have to run!" Robin argued as he watches The blue-haired princess ready her armor and weapon along with the other soldier.
"Robin, I am tired of running." Lucina let out a sigh.
There is obvious dark eye circle display on her face, months of battling and lack of food aren't helping either.
"How are you going to fight with this little number of soldiers? Chrom couldn't even win with his large number, how could you!" Robin is getting desperate as he tries to convince Lucina that she is on a suicide mission.
"The others and I thought that we could prevent our world from its grim fate but at last is but a fools dream. So why not go down fighting?" Lucina try to flash a smile but her eyes aren't fooling Robin, her eyes are the ones when someone is deprived of hope.
"Please Lucina, I beg of you to reconsider your choice. " Robin grabs Lucina's hand refusing to let go but Lucina shrugs his hands off.
"This is not a choice, we don't have any choice left Robin! Face the truth." Lucina shouted.
"So you plan on letting your father and the shepherds sacrifice to be in vain, is that what you wish!" Robin shouted back hoping that Lucina will at least take in what he said but Lucina just signal the others to get ready to move.
"As you can see, my father is already gone and we will all soon join him," Lucina said while reaching her hand out to Robin "Are you with me or not?"
"No" Robin slap her hand away.
"Why?"
"I will not join a leader who is already deprived of hope," Robin said as he walks out the camp and disappeared into the woods with his gears and ration on his back.
A few weeks later after Robin received the news that Lucina had failed and is held hostage by Grima, he traveled to the Plegian castle with a plan in mind.
As he walked into the throne room of the castle he witnesses Lucina being held up with chains on both her hands and hosted up and Grima in the body of the Robin from another time.
"I had come as you wanted, now let her go," Robin said coldly while staring at Grima with sheer hatred.
"You human will make the most idiotic decisions when you are desperate don't you?" Grima smirked.
"Just get it over with and let Lucina go, I won't resists if you do as you promised." "Fine, held out your hand with the mark."
Robin does as he told and raised his right hand, Grima quickly grabs on to the hand and darkness slowly spawn around them.
Robin closes his eyes and opens them to realize he is not in the throne room but in pitch darkness and in front of him is Grima.
"Thank you for your cooperation." Grima laughs and shows an image of Lucina.
Her chains had to be opened and she fell on to the floor struggling to get up.
"Now you can see as your precious princess fights until her last breath."
Grima turn expecting to see Robin's face in horror only to find a devilish smile.
"Thank you for letting me get close enough to do this!" Robin initiates his plan and plunges a short knife he had hidden under his robe into Grima's heart. "NO YOU FOOL!" Grima enraged but Robin didn't back off instead he plunged the knife deeper.
"Underestimation always has its prices to paid my dear dragon." Robin laugh as he sees Grima dies.
Robin blinks again and he is back in the throne room, he quickly rushed to Lucina's side and heal her wounds.
"Is it over?" Lucina said weakly "Yes, but I am not done yet." Robin smiles as his body begin to glow.
"What is happening?" Lucina slowly sit up "I going to change the past so that these will never happen." Robin smiles and hugs Lucina as he evaporated leaving Lucina alone in the throne room.