The Dark Powers

The Dark Powers are unclear at best, so what are they. The Dark Powers seem to be powers possessed by evil characters in Tolkien's legendarium. So I believe these are powers of corruption used by Melkor and Sauron in the forms of the Discord Of Melkor and the rings of power. But it seems that the all en-compassing darkness, unlight is one these capabilities alongside necromancy. That means known wielders of The Dark Powers are Sauron,Ungoliant and Melkor.