What I'm looking to do is escalate. What this encounter proved, beyond any reasonable doubt, is that our personal mysteries and the conflicts in this region are intertwined. Not sure how, but I've got some in-character speculation on that front.
Remn calculates several possibilities from the somewhat tenuous accusation of the Horned One Emissary. First, that we, as charged, either premeditated ourselves or knowingly assisted our companions in summoning the Cossateer. Second, it is possible that summoning the Cossateer was NOT premeditated, but was a last ditch effort to stave off death. Third, we could have been magical scapegoats, purposefully framed with a guilt we do not deserve. Fourth, we could have been in the wrong place at the wrong time. Finally, it could all be lies and deception for an unknown purpose. He also has theories about the potential nature of this purpose, and will didact quite mightily in the next few sessions.
Regardless of which is true, the victory we just won will likely engender us good feels from the Lesh for sure, The Caith Sidhe probably, at least one of the Tuet'ta, some of the Dirmud, and probably any kran or sparg in the know. So, since we have prior contact, a good guess that we just dealt their philosophical rival a big blow, and an already favorable disposition with the Lesh, I think this is our logical choice.
That doesn't mean, however, that it's what we should do. I would much rather someone who hasn't held the player narrative reins take this moment to explore their character concept a bit and set our next course. If I were to outline something for Remn from what I know and we have seen, Remn would charter Wezen, Zetelbrieg, or perhaps the Mother of the Wood Nymphs to lead him to one of the Winds of Change and Mercy's loci of power. He has evidence of all these powers, powers he hasn't learnedbut remembered, and they apparently stem from her.
I think if there is anything that we currently know of in the story that holds interest to one or more members of that party, it is worthy storytelling to explore. Off the top of my head, from what I've gleaned of your characters: Ian- The body augmentation of the Lesh might hold interest for Ian. Does it offend or intrigue his goal of self-improvement and power? Tai- Tai seems to me to be the most likely to suggest a trek out of the woods, or perhaps learning more about the war between the Kran and the Caith Sidhe. Who won, how, why. etc, probably with some regard to his own ambitions.
Narob- I could see Narob wanting to meet more Tuet'ta, Dirmud,see the Caer of Caers, really travel anywhere we haven't been. Volan- Volan just got his Magnetism. I've yet to see what that did to his character, but a heading for any population center would give a good amount of investigative options when paired with Remn's Psychometry.
Rather than find the quickest way to barrel through the story, I'd rather the characters informed the story, and if someone has an idea I'm all ears.