This story begins at the end of season 5.
Previously in season 5
“No, the time for all this bloodshed is over.” Morgana turns, stands and faces him. “I blame myself for what you've become...but this has to end.” “I am a High Priestess. No mortal blade can kill me.” Merlin stabs her and she starts to feel the effect of the blade. Arthur looks on. “This is no mortal blade. Like yours, it was forged in a dragon's breath.” Merlin holds Morgana as she dies. He lowers her to the ground and withdraws the sword. “Goodbye, Morgana.” She takes her final breath. Merlin goes to Arthur and helps him up. “You've brought peace at last.” “Arthur.” Merlin supports Arthur as they walk. Arthur is dragging Excalibur. “Come on. We have to make it to the lake.” Arthur drops to the ground landing on Merlin. "Merlin...not without the horses. We can't, it's too late. It's too late.” “No.” “With all your magic, Merlin, and you can't save my life.” “I can. I'm not going to lose you.” Merlin struggles to stand to help Arthur. Arthur pats his hand. “Just, just hold me. Please.” Merlin stops trying to get up. “There's something I want to say..” “You're not going to say goodbye.”
“No, Merlin...Everything you've done. I know now. For me, for Camelot. For the kingdom you helped me build...” “You'd have done it without me.” “Maybe. I want to say...something I've never said to you before...” Arthur turns his head more and looks at Merlin. “Thank you.” Arthur reaches up and touches Merlin on the back of the head. His hand falls. “Arthur...No! Arthur!” He feels his pulse. “ Arthur! Arthur. Hey stay with me.” Merlin tries to move Arthur but can't. “Arthur! O dragon! E male so ftengometta tesd'hup'anankes!” Merlin manages to get out from underneath Arthur. He presses his forehead against Arthur's. Kilgharrah arrives. “Kilgharrah. I would not have summoned you, if there was any other choice. I have one last favour to ask.” Kilgharrah takes them to the lake. Merlin is dragging Arthur toward a small boat. “Merlin. There is nothing you can do.” “I've failed.”
“No, young warlock, for all that you have dreamt of building, has come to pass.” “I can't lose him! He's my friend!” “Though no man, no matter how great, can know his destiny, some lives have been foretold, Merlin...Arthur is not just a King-he is the Once and Future King. Take heart, for when Albion's need is greatest, Arthur will rise again. It has been a privilege to have known you, young warlock-the story we have been a part of will live long in the minds of men.” Kilgharrah flies off. Merlin watches. He then lowers Arthur to the ground. Merlin stares out over the lake, holding Excalibur. He looks down at the sword, and then raises it up in front of him looking at it. Merlin then throws Excalibur into the lake and it is caught by Freya's hand and drawn back under the water while he watches resignedly. Arthur is laid in a boat, his cloak arranged and his hands folded over his chest. Merlin places a hand on Arthur's forehead. Merlin breaks down. “Arthur. In sibbe gerest.” The boat sets off on the lake. Merlin watches, weeping. In the throne room of king’s palace.
Gwen sits on the throne, looking at the Royal Seal. Leon stands beside her. She lifts her head, looks at him and gives a slight nod. The knights, the council and the court members. Percival looks up.
“The King is dead.” Gaius and Gwen share a glance. Gwen looks back at Leon. “Long live the Queen!”
and then everyone who is in the room say: “Long live the Queen! Long live the Queen! Long live the Queen! Long live the Queen! Long live the Queen! Long live the Queen!” Gwen looks at everyone standing before her.
It is now two weeks ago when I lost Arthur. It is so hard to lose my best friend. That can’t be true. I fought so hard to protect him. I did so much for him. I failed my destiny. How can I ever go back to Camelot. I disappoint everyone. I had the save him and now he is death. I hear people talking about a knight who dies too. That can’t be happening. The knight is Gwaine. Why do I lose everyone. First Will then Freya, my father, Lancelot, Elyan, Gwaine and than Arthur. I have to bring Arthur back I can’t wait till he will rise again. My mother had right. I need him and he need me maybe Gaius will now a way so I have the go back to Camelot but I’m so scared. What if everyone hates me because I couldn’t safe their king. Come on Merlin you have the go back. If there is someone who can help than is it Gaius. I take all my courage for go back to Camelot. Today my journey for getting Arthur back from death starts now. That is what I learned about friendship.