From Path of the Vampire Wiki
Fadeportals connect two distinct and unmoving points in space. When one passes through one end, they end up on the other instantaneously, as if they had been teleported. Visually, Fadeportals are completely invisible. Passing through them feels like being in the shadow realm for a split second, I. E. dark and oppressing. Fadeportals must originate in Harper Rock, because that is currently where the Rift exists. How far away from the rift the fadeportals will work, is currently unknown. The further away from the Rift, the less effective the power.
Fadeportals can be accessed by Humans, Wraiths and Vampires.