Darkness is a strange substance. Since it is a sort of mystical material, it doesn't fall under the laws of science, only able to change states by the user. In solid form its almost completely black aside from a very tiny shade of red at its centre, like a candle in the dark, when a non-user touches it its like getting winded, if hit by a sharp point it will penetrate and quickly infect. That's basically what lives inside of Renée, it's been dormant for years, held back by the part of her that was good, and now it wants out, in all it's monsterous glory, it wants to be released to fulfil its burning desires and a certain mate has sparked its fire.
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