On Whitecliff's aura, it is like nothing you've ever seen. it has some similarities to the aura elft by a divination effect, but it is less neatly structured, wilder, more 'primal' if you will. It also seems to be something coming from Whitecliff himself, rather than something that was cast on him.

The divination spell is pretty complicated. Two simultaneous effects analyze both targets for a massive amount of information (you couldn't really figure out what exactly based on a single viewing, but you get teh feeling it's not far short of everything. Certainly far too much information for a human to process themselves), then the two sets are compared, and if some amount of similarity is reached, one of the samples (in this case the vial of blood) will light up for a short while.

The illusion spell was silent image.