Gwaine died thinking he failed his friend.
Elyan died protecting someone he loved.
Leon and Percival died loyal to the end.
Lancelot died sacrificing himself to save the world.
Gaius died alone.
Gwen died heartbroken.
Uther died using his last breathe to protect his family.
Mordred died fighting for what he believed in.
Morgana died full of anger.
Arthur died thankful.
And Merlin lived on feeling all of that.