Raziel first encountered one of these 'teleportation gates' in the Underworld at the start of Soul Reaver, where he encountered the first one in the Elder's tutorial in the Spectral Realm, as he proceeded through Kain's empire, Raziel was able to activate many other warp gates and was able to travel between them by selecting the appropriate symbol for each location and then stepping through. Each warp gate was marked with a blue 'sun' symbol on a door which led to the warp gate itself (the same symbol was repeated around the warp gate itself in green when activated) and a symbol specific to the location itself indicated which warp gate Raziel was intending to warp to.