Released on The Ultimate Sin in 1986, 'Killer Of Giants' stands as a defining track in Ozzy Osbourne's discography, showcasing his evolution from hard rock to a heavier, more aggressive sound. The song features Osbourne's signature vocal delivery, characterized by a gritty, raspy tone that became a hallmark of his career. Musically, it blends elements of heavy metal and hard rock, driven by a powerful rhythm section and a driving guitar riff that captures the energy of the mid-80s rock scene. As part of the band's later work, the recording reflects the band's shift away from the polished production of their earlier albums toward a rawer, more visceral aesthetic. The track remains a staple of Osbourne's live performances and has cemented his status as a pioneering figure in heavy metal history.