I haven't done this, but here is some general information from the changelog:
the Nephlune Priestess now also opened up her church! Just speak to her if you have given her 4 drug formulas to destroy, she will give you a major corruption reducing item (Blessed Water+) and open up the church on the next day.
Here you will gain access to two new skill. The last rank I light spell "Divine Guard" which will make your Guard action twice as effective - Useful against enemies that have 1 attack that hits like a truck. And then another skill that I expect will be very useful for purity oriented players "Peaceful Mind" which negates 10 willpower damage from corruption on day start.