Euchdag

"The Diamair will tell us. The Diamair is the key to all knowledge."

- Ruadan

The Euchdag (also known as the Diamair) is a creature that carries a great burden – the gift of all-knowledge. Shy and elusive, she has been driven underground by those desperate to seek her out. She casts a spell on an unconscious Gwaine, when the latter sees a light but is ambushed by Morgana's men when he goes to find out what it is.

Trivia

 * She is implied to be very involved with 'Arthur's Bane'.