Federico Augusto Ágreda Álvarez, best known as Zardonic, is a Venezuelan keyboardist, DJ, composer, producer and remixer known for his drum and bass act as well as his dark ambient, black metal and minimal techno sideprojects. His remix work include tracks for Nine Inch Nails, The Berzerker and Gorgoroth, as well as original releases in Dieselboy's Human Imprint label and Skrillex's OWSLA label.