Nathair

"It's a Nathair, in the mountains of Asgaard. Harmless enough most of the time, but with a little persuasion, it can cause a man pain beyond all imagining."

- Morgana to Elyan

The Nathair is a serpent-like creature from the Mountains of Asgorath. It's harmless most of the time but with a little Persuation it can torture victims to the limit of human endurance, as stated by Morgana.

History
Morgana used a Nathair on Elyan to find out where Arthur was hiding after she conquered Camelot. She enchanted the snake with this spell: "Unmicel snẵca, suge þa soþẵn... swilcnesse", and had it bite Elyan several times. When the knight was brought back to his cell he was catatonic and Gaius was able to recognise the serpent's bites on Elyan's neck. The serpent served its purpose well, as Elyan couldn't handle the pain and eventually told Morgana Arthur's whereabouts (The Sword in the Stone).

Appearances

 * Series 4
 * The Sword in the Stone: Part One