Revelgloss

The Dreamer (also called Revelgloss or the Lost One) is called the prince of lies and nightmares. They supposedly left the court of princes to wander the physical world hundreds of years ago. It's unknown if this is true, but a number of people are very invested in the idea of finding them and sending them back to their plane. They have been worshipped as one of Mesnea's demon princes for all of recent memory.

While they do have some warlocks, they do not often bestow powers and have very little thematic consistency in iconography.

If manifested, they're said to have a kaleidoscopic effect in their appearance, and to warp space around them into surrealist nightmares; if they are still present in the world however, it's likely they've adjusted their form.