Silverweed
Silverweed is the storyteller in the Warren of the Shining Wire whose grim, abstract poetry made Fiver uneasy during the Watershippers' stay there.
Watership Down (Series)
Silverwed is the mystic who catered to the rabbits of the Warren of the Shining Wire with his grim, abstract poetry and warped religious incantations. To the desserters who lived in Redstone, he was regarded as something of a boogeyman they used to keep their children behaved: "Be good, or Silverweed will get you!"
Despite this, Silverweed was actually a small, quiet rabbit. He had powers similar to Fiver, such as the ability to look into another rabbit's mind and heart to know their true self. Silverweed was "bought" from his master Cowslip by General Woundwort with the lives of the Redstone rabbits (or so Woundwort thought), and he accompanied Woundwort and Captain Vervain to Darkhaven for the purpose of using his psychic abilities to learn the location of Watership Down by invading Fiver's mind.
He was abducted by Captain Campion and Blackberry however before he could do so. Fiver, proving to be the more powerful psychic between the two, briefly took over Silverweed's mind, forcing his counterpart to come to him. Although Silverweed was initially reluctant to leave his master's side, once he saw Watership Down he decided to stay.