Tantrasara mentions the iconography of your goddess Bagulamukhi. It mentions which the goddess is seated on a golden throne floating while in the amazing ocean. A further etymology indicates that valga means "to paralyze" and symbolizes the strength of stambhana, "paralysis" which the goddess is alleged to grant; this https://kameronljgbx.targetblogs.com/33156641/baglamukhi-an-overview