Rift creature

A rift creature is a trans-dimensional abnormal species.

This creature normally does not exist within the normal plane of existence of the Sanctuary universe.

During Nikola Tesla's time working as the SCIU director of Area 51, he worked on an experiment to use a modified rift node design in his attempt to create self-sustaining wireless energy. The rift field created by this machine allowed the creature to gain access to this world.