Do you check vs corruption when you perform a sacrifice? Any of the feat types: ritual, oportunistic or tortured.

Even if there is nothing in the rules (?), I'd recommend it. Maybe with the exception of willing sacrifices: "Here I come, mighty Zath, may I be worth of your purity!" For example Aztecs saw some sacrifices as a honour for the chosen one and his family. Such "political correct" sacrifices aren't evil in the cultural context (no, this is not a statement about the universality of human rights in our time :wink: )
Corruption rules are deliberately vague so the GM can includewhatever he deems appropriate.

I would make the person doing the sacrifice test as well as anyone in the audience. (lol)