Boroboro-tone

In Japanese folklore, a creature that turns into an old, worn-out blanket-mattress. It can strangle people at night.

The very name of this tsukumogami apparently comes from the "mantra" of Zen Buddhist monks of the Fuke sect, who profess the non-existence of all things: "Boro-boro-boro". Well, plus, the Japanese creators of all kinds of creatures' favorite word game, where "boroboro" means "worn out, crumbling". ​‌​‌​‌​ ​‌‌​‌‌​ ​‌‌‌​‌‌ ​​‌‌‌‌