A different tale data that a demon named Madan acquired Vak-siddhi, by which whatever he claimed came true. He misused it to trouble human beings and murder men and women. One more etymology suggests that valga signifies "to paralyze" and symbolizes the power of stambhana, "paralysis" that the goddess is claimed to grant; https://www.youtube.com/shorts/5VeSyP9JRw0