A famous volcanic rock located in the mountains of Nasu in Japan has split in two, spurring long-held superstitions.

Photos shared on social media show the Sessho-seki known as the “killing stone” cracked down the middle, which, according to mythology, held the evil spirit of Tamamo-no-Mae, a woman said to have plotted to kill Emperor Toba during his reign from 1107 to 1123. As the story goes, she was killed by a famous warrior named Miura-nosuke, and her evil, nine-tailed fox spirit was entrapped in or became the stone.