Abyss

The Abyss was a swirling sinkhole of water that led into a massive underground area The Lake of the dead and was connected to a number of Waterfalls and rivers. The top of the swirling Abyss was green as was the water below and was used by Kain as an exceution ground for traitor's and weakling's as Water completly destroys a Vampire's Body it was extremely painful and horrible death for a Vampire. After Raziel surpasses Kain's own Evolution by developing a pair of Bat Like Wing's Kain seemingly out of jealousy or anger rips the bones out of Raizles Wings and orders him to be cast into the Abyss meaning he couldnt fly and suffered Greatly as shown in the intro to Soul Reaver.

The Elder God or at least part of it resides at the bottom of the Abyss and claims to be responsible for Raziel's Ressurection. It is here that Raziel returns if he is too greatly wounded to maintain his Physical and Spectral Form.