Yet another tale records that a demon named Madan obtained Vak-siddhi, by which regardless of what he explained arrived genuine. He misused it to trouble humans and murder persons. A further etymology indicates that valga means "to paralyze" and symbolizes the power of stambhana, "paralysis" the goddess is said to grant; this theory https://www.youtube.com/shorts/5VeSyP9JRw0