Vishklars were a humanoid species from the Seretti dimension.
Biology
Vishklars were not initially physical beings, though they could feed on human nightmares and come through to gain a tangible form. (TV: The Nightmare Man)
History
In September 2010, a Vishklar used Luke Smith's dreams to come through into the universe. He began to give others nightmares and grew more powerful, but was ultimately defeated by Luke, Clyde and Rani. (TV: The Nightmare Man)