There is a certain kind of spell (Song) in In Nomine used for bodily transformations. This was used for things like wings, claws, and tails, among other things. I'm forgetting the correct spelling, but I think they were called Numinous Corpus, but that doesn't feel like the correct Latin. I've had this come to mind in the past, but now seems a good time to mention it.
Numinous Corpus Slender Man
Having read Don't Look, I'm now thinking a full set of songs. Corporeal gives the physical transformation, and is essentially NC:SM, Ethereal is either some way of avoiding attention from humans who are not symphonically aware, luring children who are not symphonically aware, or of terrifying people who are not symphonically aware, and Celestial probably gives a certain level of Role: Slender Man, which is essentially Role:Murderer or Role:Child Murderer.
I've also been thinking of a cross between Magical Burst and Eclipse Phase. The EP Ego/Morph stuff being attached to the MB Magical Girl stuff with a glue of Liche. A Cortical Stack is something like a phylactery. Madoka makes a certain amount of sense if the Ego is in the Soul Gem, and controls the Morph via a short range wireless link.
Numinous Corpus Slender Man
Having read Don't Look, I'm now thinking a full set of songs. Corporeal gives the physical transformation, and is essentially NC:SM, Ethereal is either some way of avoiding attention from humans who are not symphonically aware, luring children who are not symphonically aware, or of terrifying people who are not symphonically aware, and Celestial probably gives a certain level of Role: Slender Man, which is essentially Role:Murderer or Role:Child Murderer.
I've also been thinking of a cross between Magical Burst and Eclipse Phase. The EP Ego/Morph stuff being attached to the MB Magical Girl stuff with a glue of Liche. A Cortical Stack is something like a phylactery. Madoka makes a certain amount of sense if the Ego is in the Soul Gem, and controls the Morph via a short range wireless link.