(A/N): This is my first Merlin fanfic. It's based off of royalprat's drawing, which you can find a link to on my profile. Anyway, here it is!
One thought was going through Merlin's mind.
We're losing the battle!
Merlin sprinted across the blood-covered field, using magic to dodge arrows as he did. With a sword in hand, given to him by Arthur, he parried all attacks that came at him. He couldn't waste any time. He had to find Arthur.
"Arthur!" He cried. "Arthur! Where are you?" He doubted that Arthur could hear him over the clanks of swords and the cries of men as they were dealt their death blow.
Suddenly, he heard a cry for help behind him. Merlin turned to see Arthur fighting numerous men, and many more coming at him. "Help me!" Arthur yelled. "Any of you, help!"
Arthur's eyes roamed the battle field, finally locking eyes with Merlin. His eyes filled with relief. He opened his mouth to say something."Mer-!"
Arthur was struck. Slowly, his hands went to his side, where blood was slowly pouring from his body. He looked to Merlin, pain and worry flooding his eyes.
Everything around him seemed to slow down. Merlin watched as Arthur sunk to his knees. "Arthur!" Merlin screeched. Arthur fell forward, trying to brace himself with his weak arms, but with little success.
"No…" Merlin whispered. He looked around. He looked around him: Bodies of fallen knights laid in blood. Some of them he knew, though they were never really his friend. "No." Merlin said again, his eyes turning gold, his magic beginning to rise up within him. He felt his magic begin to take over him, his rational thoughts leaving his mind. Right before he lost his hold on his magic, he saw Arthur look at him, his eyes filled with sheer terror as his mouth hung open in shock as Merlin was being enveloped in white light.
Merlin was bathed in a column of white and gold light. He poured his anger into the light. He willed it to go and destroy every enemy solider in sight. He didn't want a single survivor from the opposing army. He needed them dead.
Suddenly, he felt a tug at the pit of his stomach, and the light went out to do his bidding. With every knight the light touched, Merlin could feel their life leave their bodies. One by one, each mercenary fell to the blood-stained battlefield. The light continued to spread, until not a single one of the enemy's men was left.
Slowly, Merlin regained control over his body. He felt dizzy, almost sick. He looked around through his hazy vision, and saw bodies spewed across the field. But, that wasn't the only thing that he saw. The Knights of the Round Table were surrounding him. For a moment, he thought he wasd dead. That was until Arthur pushed his way past Sir Leon, his hand across his stomach and holding his side. Merlin could see there was only one emotion on Arthur's face: Betrayal.
Merlin's vision suddenly blurred, and his legs became weak. He saw Arthur's lips move, but he couldn't decipher and words that came out.
His eyes rolled back as he fell to the ground. As Merlin slowly lost consciousness, he realized what Arthur said.
"You're a sorcerer?"