Nightbringer | The Arthurian Online Encyclopedia

Dragon Banner

Merlin gave Arthur this banner for his battle against the rebel kings. It was sometimes carried in battle by Sir Kay, sometimes by Merlin himself.

On at least one occasion when Merlin was bearing it, the dragon on the banner spat fire and flame; this, however, may have been a specific magical act of Merlin’s rather than a property of the banner itself.

See also
Dragons | Myths and Legends