It seems the side of Elder Seraphelis focused on dealing with the darkness and the sullied side of the whole faction of Oblivion's Embrace.
Azrail spoke, the tea having being finished on both his glass and Lyx, the words spoken by Lyx has only opened up to him more truth about the whole way it is, to Thanatos, Seraphel is his cleaner, the one that takes away the dirt that has fallen into the faction, the cleaner in a sense that deals with holding the information.
It just isn't the information, they are not just the parts that record the information but also the ones that gets information out of people that need be done, the voice of theirs seductive enough to get the answer from anyone with a weak will, they all being trained to get into any place and get any info, even from the dead.