A Different tale information that a demon named Madan obtained Vak-siddhi, by which whichever he mentioned came correct. He misused it to trouble people and murder people today. One more etymology suggests that valga implies "to paralyze" and symbolizes the strength of stambhana, "paralysis" which the goddess is claimed to grant; this idea https://www.youtube.com/shorts/5VeSyP9JRw0