He told Revolver: "It was very much about dying, about giving your last breath and passing your spirit on." But the track didn't make it on the band's comeback album 13. "We never came up with the finished thing," says Butler.

Butler admitted that he feared the worst for Iommi, because former frontman Ronnie James Dio lost his battle with cancer in 2010. He added: "We didn't know if [Tony] was going to recover from it, especially after seeing Ronnie go so fast. Ronnie went right in six months from being diagnosed to dying."