"City of Dreams"

The "City of Dreams" was a powerful entity from Doctor Strange and an enemy of the native Sorcerer Supreme of the Earth realm.

History
Among many victims of the creature was Blue Erik of Illeryia who was the only one giving it a good fight.

After millennia of sleep the creature sent out an assassin from its home dimension into Dr. Strange's Sanctum Sanctorum. It was only a dream, but Dr. Strange fought and defeated it nonetheless. With a spell of inverse he followed the reappearing assassin to the "City of Dreams". There Dr. Strange heard the hum of the sleeping creature, but he didn't know what it was. He saw buildings whose walls were warm and felt like skin, but he didn't know why. Dr. Strange thought that this was his rise to godhood and Dr. Strange nearly surrendered to the darkness, but with a spell of light he broke the illusion. The light revealed his old nemesis Nightmare coming for him, but Dr. Strange saw through the illusion this time and defeated it only to see that the illusion turned into Eternity who craved for Dr. Strange's destruction because he had become too powerful. Dr. Strange destroyed this new illusion as well and finally saw a pattern. The hum ended and telepathically the creature began to speak to Dr. Strange. It was surprised that Dr. Strange saw through the illusions so fast. It revealed to Dr. Strange that it sent out its assassins in all the dreams of powerful beings like Dr. Strange to lure them to him. Dr. Strange's resistance aroused the creature's interest and now the creature wanted to awake to devour the Sorcerer Supreme. Dr. Strange created a doppelganger to oppose the creature and cloaked himself. The creature was attacked by the doppelganger and it was impressed by the strong blow which reminded it of the power of Blue Erik of Illeryia. The creature's eyes opened and it finally saw Dr. Strange (only the doppelganger). With a blast from its eyes the doppelganger was no more. When the creature couldn't smell anything it thought that everything that just happened was merely a dream and returned to its sleep. Dr. Strange silently left for Earth and sealed the gateway between his and the creature's dreams so that it would never find him again.