Dreams were a rather special phenomenon.
Unlike biological phenomena in an atheist world, in a supernatural world full of gods and monsters, dreams naturally carried a rather special symbolism. And in a world like Transia, where the convergence of any symbolism could bring power, dreams could naturally be regarded as a unique domain of power.
It was a special plane between reality and illusion, more like the "shadow of the world" than the expanding Underworld, but it did not come close to being as real as the Emerald Dream.
In the world of Transia, the power of dreams was not strong. Of the supernatural forces Murphy knew of that specialized in dream power, the only one was the Nightmare Tyrant Baphomet, who was still sealed inside Baphomet's Great Dungeon.
That guy was a real unlucky bastard. According to Lord Payne, he was the oldest "guest" in the prison for the Old Gods in Eden.
The disaster a thousand years ago had shattered Eden. Plenty of strange things had escaped during the crisis, but the damn prison for the Old Gods had remained intact. In all these years, only Lord Aurora had managed to escape by selling herself to survive. The Lord of Darkness had already gotten out, but after Murphy's "tyrannical might" forced him to face the powerful suppression of the Radiant Divine Artifact, he had fled back into his prison.
In short, the tragedies surrounding the prison for the Old Gods could be recounted for ten days and ten nights, and every one of them was different.
Back to this unique domain of dreams.
Besides Baphomet, the Nightmare Tyrant with a backstory tragic enough to make anyone who saw him grieve and anyone who heard of him weep, only theologians with an extensive knowledge of gods and divine power