"ábir sóþ!" said Merlin, and his eyes flashed gold.
Mithian blinked, then started talking. "King Odin and Morgana Pendragon overtook Nemeth," she said. "Morgana made me flee with her to Camelot. She's disguised as my maid, Hilda. She wants you to go to the tomb where my father is being held captive so Odin can kill you."
Merlin was shocked, but hid his surprise well. Arthur, however, didn't- after gaping for a few seconds at Mithian, his face became angry and he said, "Morgana will pay for this."
Merlin immediately ran towards towards the door, getting there before Arthur. "Arthur, listen to me," he said. "You can't go against Morgana now."
"Why not?" Arthur growled.
"Because she's got magic on her side, and you don't," replied Merlin.
Arthur sagged at the reminder. "Then what are we to do?" he asked.
"I'll take care of it," said Merlin coldly, and left the room.
Merlin walked through the castle, heading towards the guest chambers Mithian was staying in. When he got there, the door was closed. Merlin felt the presence of the ageing spell Morgana was using, so he quietly knocked on the door.
He heard footsteps getting closer, and the door opened. "May I come in?" he asked.
Morgana's face showed some surprise. "If you want to talk to the Princess, she isn't here," she said.
"That's okay," said Merlin, and entered the room. "I want to have a word with you."
"What is it?" asked Morgana.
"Ástríce!" Merlin said as his eyes flashed gold. Morgana went flying through the room to hit the wall, where she slumped unconscious.
Merlin smiled, and his eyes flashed again. Morgana rose up into the air, and Merlin walked out of the room, Morgana floating behind him.