The Lesser Key of Solomon
Valac is a demon described in the goetic grimoires "The Lesser Key of Solomon" (in some versions as Ualac or falak and in Thomas Rudd's variant as Valu), Johann Weyer's "Pseudomonarchia Daemonum" (as Volac), the "Liber Officiorum Spirituum" (as Coolor or Doolas), and in the "Munich Manual of Demonic Magic" (as folach) as an angelically winged boy riding a two-headed dragon, attributed with the power of finding treasures.