Venin

Venin was a demon who called himself the "Demon of Anger", as his power was feeding off of people's lively hood. Unlike most demons, he would never attack his victims when they are conscious. Instead, he would wait until they fall asleep and attack them then. During one of his attacks, he appears invisible with only his physical form above the victim.

One of his many and last victims was Cassandra Halliwell. He was later vanquished after Cassandra (and company) refused to fight him in the dream.