The Underworld, in the context of Legacy of Kain: Soul Reaver, was a network of submerged caverns at the bottom of the Abyss and the Lake of the Dead, inhabited by the Elder God. It was where the Elder resurrected Raziel following Raziel's execution in the Soul Reaver era. The Underworld was one of several subterranean areas in Nosgoth into which the Elder God's body had encroached. In Legacy of Kain: Soul Reaver, it served as a hub area for Raziel's quest against Kain's empire: whenever his health coil was fully depleted in the Spectral Realm, he would be drawn here.