Cause a person to act upon their repressed emotion, which usually ends in violence.
Releasing Repression is the act of feeding on someone's repressed feelings, by pointing a hand in their direction. This act will weaken victim's self-control, causing them to act upon their repressed feelings and lose focus. The possessor, on the other hand, will become stronger and more powerful, but can overdose if they absorb too much. This power is unique to the demon Lord Dyson.
Unfortunately, his desire for more power eventually led to his death. He made the ill-fated decision to feed on Leo Wyatt's pent up rage and hostilities and it proved fatal, killing him in a huge explosion.