A/N: Keep in mind that I only watched the last two episodes of the series only once. I haven't been able to bring myself to them watch again yet. It still hurts. Hopefully this story will make it easier.
Mordred laughed as he watched Merlin cheat the king out of last of the money he brought to the tavern. Merlin was using his magic to win and it seemed that Arthur was none the wiser.
"Are you trying to buy the kingdom from me, Merlin?" Arthur asked, drunkenly.
"I just might," Merlin replied with a cheeky grin.
"Are you using magic?" Arthur accused as he took a gulp of his ale.
"I would only ever use my magic to do my chores or save your royal arse," Merlin answered as he rolled the dice.
Arthur stared at the warlock with unfocused eyes. "You've been using your magic to finish your chores quicker, haven't you?"
"No," Merlin quickly denied. "But while we're on the topic. I think Mordred has been using it to beat you during training."
Arthur turned his head and looked at Mordred, who was currently trying to hide himself behind Gwaine. "Mordred get over here, now."
As Mordred walked over Arthur, he looked Merlin, who was trying to hide his drunken laughter, accusingly.
"You'll pay for this," Mordred warned.
After receiving a drunken lecture from the king, Mordred left the tavern and headed back to his chambers. He was going to have to plot out his revenge for Merlin being a tattle-tale.
Little did he know that something was lurking under his bed waiting to attack.
While back at the tavern, Merlin continued to beat anyone who challenged him in a game of dice. Soon the fun ended, when he realized that if he kept drinking the way Gwaine usually did, he wouldn't be able to do anything tomorrow. Also he couldn't risk people realizing that he cheated the king and the knights out of their money. So he just paid his tab and left.
Merlin rubbed his forehead as he walked towards his and Gaius' chambers. He could already feel a hangover coming on. He cursed the second he stepped into that tavern. He was never going to drink again.
The warlock stumbled into the chambers, trying not to make any noise, but ultimately failed. He managed to trip over something, and knock a bunch of things over.
After getting up and looking over at Gaius, who hadn't even stirred from all the noise Merlin caused, he made his way to his room, flopped on to his bed and closed his eyes.
Not even a minute had passed before he felt something slithering up his body. Before he had a chance to react, the thing latched itself to his face.
In a fit of terror, Merlin jumped from his bed, knocking several things over in the process, as he attempted to pry the thing off him.
Within seconds he got the thing off his face and tossed across the room, just as Gaius came bursting in.
"Gaius?" Merlin gasped as he looked at the physician while trying to cling on to consciousness.
Gaius hit the black blob with a spade, killing it, before he made his way over to Merlin.
Mordred woke up on the floor of his chambers. For a moment he was confused as to why, but then he remember that an over-sized leech had attacked him and he killed it with his sword. And only after he had pried it off his face.
The Druid got up as he muttered a spell for the pitcher to a pour some water into the goblet next to it, only to realize that it did not work. After several repeated tries, Mordred felt panic rise in his chest as he rushed out of his chambers and made his way to Merlin and Gaius'.
Mordred burst into the chambers only to see, Gaius stepping out of Merlin's room.
"What happened?" Mordred asked.
"Merlin was attacked by a Gean Canach, a creature that sucks the magic out of anyone who has it. I don't think it had chance to get to Merlin's though," Gaius explained.
Mordred dropped to his knees as realization hit. The only two sorcerers in the castle were attack by the same thing.
Gaius was by the knight's side in a minute to keep him from collapsing entirely.
"Mordred?" the elderly man asked with concern.
"I- I don't have any magic. I was attack in my chambers by one of those things," Mordred replied slowly.
The old man helped Mordred stand up and led him over to the table and sat him down on the bench. "Tell me what happened."