Bone spider
From Tardis Wiki, the free Doctor Who reference
Bone Spiders were sentient creatures that fed off dreams. They could force an individual to live out their greatest nightmares, by making them come to life. They would then trap their victims in strong strands of webbing, which could also preserves the victim's form and make them invisible to others. They could also create stone version of other beings, which would collapse upon being touched by a living being. (PROSE: The Stone House)
