Nokkers

Nokkers are unknown creatures that were created to impede [Fushi's](https://anilist.co/character/136548/Fushi) progress in preserving the world. [The Beholder](https://anilist.co/character/136553/Kansatsusha) named them "Nokkers" because they "Knock on the doors of paradise, seeking its destruction." A Nokker's main form resembles long, presumably sharp, vines. However, they adapt to their environment and take on various other forms - forms stolen from Fushi. Each time a Nokker is defeated they are said to come back stronger each time.