Well, I could try to mix up DW completely and explore the purity/impurity aspect of the character. But that could get very complicated. But... well I guess it is kind of a unique thing with Skye. Tentatively the first thing I think of is something along the lines of purification. It could weaken Grimm or even turn them in extreme cases, or just kill them as Grimm kind of thrive on darkness and evil... eh, what do you guys think?