Valac

The sixty-second demon of the Goetia, Valac is also named in both Wierus's Pseudomonarchia Daemonum and Scot's Discoverie of Witchcraft.  He is said to assume the form of a boy with angel's wings.  When he is called to appear, he comes riding a two-headed dragon.  He is credited with the title of president and is said to hold hominion over thirty legions of infernal spirits.  He has a strange power over serpents.  He magically knows the location of these creatures and can deliver them across any distance to his conjuror.  He will also reveal the location of hidden treasure.  According to the Welsh Book of Incantations, in addition to his other powers, he renders serpents harmless so they are safe to handle and study.  He appears under the spelling Volachin the fifteenth-century grimoire known as the Munich Handbook.  Here, he is reputed to be a beautiful boy with not one but two heads, and wings like that of an angel.  In the Goetia of Dr. Rudd, he is said to be ruled by the angel Jahael.  In this text, his name is spelled Valu.  Another variation of his name is Volac.  See also Book of Incantations, Goetia, Munich Handbook, Rudd, Scot, Wierus.
THE DICTIONARY OF DEMONS, REVISED AND EXPANDED, M. BELANGER (2021)