Bone spider

Bone spiders were sentient creatures, which could make dreams tangible. They could not distinguish between good dreams and nightmares. They could create a thin layer of web around a person that would make them invisible to others without obscuring their own vision. They could also create stone version of other beings, which would collapse upon being touched by a living being. (PROSE: The Stone House)

History
Many years before 2016, a female bone spider fell through a tear in space-time and ended up in Alice Parsons' house. The spider remained invisible but showed herself to save Alice from falling down the stairs. They became unlikely friends. In 2015, the spider gave birth to a baby. Shortly after that, Alice died. Playing, the baby spider crawled into her coffin and, unseen, was taken with the coffin to her crypt. The mother remained in the house desperate to find her child, trying to send it a message.

A young teenage Syrian refugee Amira sensed these messages and hid in the house from the her smugglers. Without showing herself, the spider did not let Amira out of the house and hid her from prying eyes, providing her with safety for the first time since she fled Syria. Amira occasionally removed the protective webbing, and was once seen in the window by Tanya Adeola. After Tanya decided to investigate, the mother spider trapped her in the house too. After uncovering the truth, the Coal Hill defenders found the baby spider and returned it to the mother. Both spiders remained in the house until such time when it would be possible to return them to their home planet. (PROSE: The Stone House)