In short: we met all of them, save for Dian, Fionn and Ethniu. Actually, there was also another girl, who did not speak, and I have a suspicion about who she is, but I think Celeste would know better.
They were all stunningly obtuse, as one would expect. The only answer we received was about the plan, which they claimed that we would not understand, and to be frank, we did not. But what they said ... the plan was to create a prison, and that prison was the negative space between the world split in half. In order to maintain the prison, they required seals with souls keyed in them. Seven seals, they said, with one an anchor to control the others. I'm sure that if I missed a detail that the others can help. And that hopefully, it will make more sense to someone who does understand magical theory.
Then, they left us a task that we must complete by the next Moon Festival, and when we complete it, apparently, they will actually answer our questions. The said that we weren't ready until we did this. They want the four jewels of the ... aesdana. I think that's what Danu called them. She wants - and I know I'll have the spelling of this wrong because that is the way with most foreigners and Kilian words - the kairé, sleg, lea fall, and claydeb soaig brought to the Citadel. That is how we will prove ourselves.
That is ... wait, there is one last thing. They didn't know what happened to Fionn before he died. I think that was the question they answered. Kail fired off four or five in a row just as they were leaving, so who knows, that answer could be for all of them. Not at all comforting, is it?