He lifts his head slowly, and raises his hand to wipe the blood from his eyes. They are all staring at him, ready to carry out the law. Their law. He smiles at them. A small smile, but a gesture that sets them on edge. His teeth are tinted red from blood, his own blood, and it drips down his chin. He doesn't bother to wipe it away.
"You will come with us," they say. He can't get up on his own, so two of them help him. They carry him to the room. The last room he will ever see. His execution room.
"You have been found guilty of treason, felony, and murder on countless occasions. By the Order of the Shadow Proclamation, you, the Doctor, have been sentenced to your death."
He chuckles, and they wince. It is not often that dead men walking will laugh, especially in front of the Order. They quickly gain composure, and the speaker continues, "You will be injected with the sap of a Judas tree, a poison lethal even to Time Lords. The sap has been genetically altered to take effect in three minutes, at which point…"
He looks down quickly. Even they cannot admit to what they are about to do. They push him into a chair. It's very comfortable, for a chair that people sit in to die. He almost forgets what is about to happen, but he remembers when one of them approaches him with a needle. They pick up the needle, and push it into his arm. The sap burns as it enters his bloodstream, and he fights back a scream. He motions for them- her; it is a girl, he realizes –to come closer, and she does.
"Just remember- you killed the last of the Time Lords." He whispers. Her red eyes widen. She is young, he notices. He chuckles again. "No. I want you to know that I deserve this, for what I did."
She looks at him, clearly confused, before backing away and joining the rest of them. The sap burns even more now, but he does not give in. They want to see him suffer, that's the reason they chose to kill him with Judas tree sap. He will not give them the satisfaction. He attempts to clear his head and calculate how much time he has left. Less than a minute.
He thinks back to all the things he's done. The lives he's saved, the lives he's destroyed, and the lives he had forgotten about until now. He thinks about Susan, and Sarah Jane, and Amy, and Rose. All the people he has left behind, on his walk through the darkness.
He always thought he would be angry, when the time came. He always thought he would try to fight it. But now the time has come, and as the blackness approaches, and his eyes flutter, he realizes: he is happy with what he has done. With the life he has lived. The mistakes he made: for the better. The wrong turns he took: always lead him to where he needed to be. The people he killed: well, now he must greet them in the Cimmerian shade. In his final seconds, after living over a thousand years in sadness, the Doctor is finally, truly happy.