Count Greyskull
Greyskull nodded before working his arcane art. He raised his hand and let mana flickering around his fingertips, flickering like light glowing in horrifying hues, colours beyond those birthed of the three primaries, hyeroglyphs of a forgotten time were inscribed in the air.
It was grotesque, obscene. No creature of this earth should be allowed to tamper with that kind of power. Grim words in an ancient tongue echoed forth, a language that could instill fear into the hearts of daemons and abyssal fiends alike.
"D e d u s t."
Almost instantly, the dust in the room collected around his hand, like powder swirling in a myriad of colours, only for the skeleton to cast his arm forward. The dust surrounded the girl and engulfed her in a swirl of colour, a layer of dust so thin it could barely be felt which etched on her skin like fire.
Soon, it spread to her whole body. A final flick of his fingers caused the dust's colour to shift and impregnating skin with new colour.
Or rather, giving such an impression. It was only the dust, really. Her skin had not changed one bit, and neither her body. The spell did not act on her, but on this thin layer that would absorb light and reflect it in particular ways to give off the impression that her body was no different than any other's.
Because it was completely clad in this thin layer, it was not truly visible. As long as the magic dust was bound to her, her true form would not be visible. When he said the illusion would overlap her, it meant it litterally.
Finally, the skeleton cleared his throat and tapped her shoulder nervously.
"Tadaam! It's, erm, done. Do you like it?" He said, trying to hide a tinge of excitedment behind his embarassment, or vice versa.
