Whenever I dream of a new monster, I feel compelled to write about it here. Which, odd, but I'll own it.
Now I don't recall all the details of how this worked, but the dream started as a mystery that I was apparently trying to solve. Bodies were piling up in the town I lived in. And, weirdly, even though the bodies did not look much alike, they seemed to share the same DNA. Or, at least, partly shared DNA. Sort of a chimera. At least, half of them did. The other half were simply murder victims, obviously murdered by the chimera, but the chimeras had no real cause of death, They just...stopped.
Helping me in my inquiries was a young, blonde woman from some Nordic country (I'm not certain which). Let's call her Annika. She aided me not because she was qualified, but because she'd been at the scene of one too many of the crimes for it to be a total coincidence, but she was certainly not the culprit, proved by physical, metaphysical, and even video evidence. She claimed that her twin brother, long dead, was manifesting around her and attacking random strangers. Indeed, the chimera DNA was very close to her own, close enough to have been a match for her brother, although why the bodies didn't share his face and where they came from in the first place was still a mystery.
Sadly, much of this middle parts of this story are lost to my memory, but for some reason we wound up trapped in a locked house scenario. And, as in all such scenarios, people began dropping like flies. Naturally, Annika was nearby with all of them, but I too saw one or two of them. And what I saw astounded me. Out of thin air, her brother would spring into being, and suddenly attack another person. Usually with a knife. And because they were caught totally by surprise and off guard, his first stroke was fatal. Then, after, he would stiffen, the face would change utterly, and his body would collapse. Dead. Annika, meanwhile, was not helpful, curling into a ball and getting as far out of the line of fire as she could get.
This would obviously not do.
I was a minor spell caster in this dream, and conducted a seance to contact her brother. Nothing. Then I did another spell, one that would allow me to see into the spirit world (probably taking some pills in the process, which made real me nearly wake up in horror). Annika assisted in the first, but not the second. So she was not aware I could see what was happening the next time her "brother" appeared. Didn't know I could see her spell take shape, form a body out of random ether, and see her consciousness channel through that construct. It wasn't her brother's spirit killing people. It was her, forcing his body to form again and again while she controlled it to kill. I dismissed the construct next time it started to form, knocking her back into her own body and throwing her off for a moment, which I used to place a magical lock on her abiltiies. She smiled. "My brother tried that too, you know." She told me. "Just before I killed him. Turns out, if you kill your own twin, their echo stays with you. And you can force the doppelganger into existence."
Someone else had showed her how to do it, because he too had killed his own twin, and had found in her an apt pupil. Right up until he became the first victim of the current murder spree.
She then fought the binding, and used the innate connection she had to her twin to put her magical abilities into another spirit, evading my lock. I managed to shut down the doppelgangers as fast as she formed them, but let it distract me too much. Because she had a knife too, all this time. And managed to confuse me so much with the magical attacks I forgot to watch the physical.