The Euchdag aka The Key aka Diamair

EPaws 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. EPaws POV I know it is going to be unpopular but I rather like ET. Me thinks ET will come back again and like Alinor, Merlin has another ally. This is a very good thing. He is going to need them.

MISAforever I loved ET.. With his all knowledge s/he could give some to our boy...

BradAngeleyes TPTB have outdone themselves again because it looks to me like the Key to all Knowledge is a POC.

EPaws Josette Simon is the actress who played the part.