At this point anyway there is more we don't know about Nemesis than we do know...
Very true!
I wonder who
does know more?
Titania likely knows more than she said. Mab, I'm sure; and Odin. Maeve looped-in Lily, but only to deceive her, and we don't know what Molly and/or Sarissa know. Several (if not all) of the Fallen, and Uriel of course. [ Maybe Harry could get another Shadow, spend a few years converting it to an ally, and learn that way... YeahNo, I know: not gonna happen, and also a
Terrible Idea ]
Ferrovax certainly knows
something. Also Drakul (who may
be an Outsider, trapped in a mortal's body).
Who might, in particular, be able to tell Harry more? The fae likely cannot: it's "valuable info" and Harry cannot afford to purchase it. Lea might be an exception, if she's still acting as his Faerie Godmother (when does that expire, if ever?)
Ebenezer? Perhaps... but perhaps not. He's
aware of Outsiders, broadly-speaking (likely knows more than about them than Harry, e.g. recognized "Cornerhounds" & their strengths/weaknesses, educated Harry); but Eb seems focused on the "Black Council" and I don't think we've seen him ever show signs of knowing about Nemesis...?
Odin has been willing to give info to Harry "for free." But only in a few specific cases, and we don't know if this qualifies.
Does Kincaid know? Or Goodman Grey? Other supernatural merc's? (because, by definition, merc's are in the biz of selling their expertise).
I wonder if the Warden could compel the info from Ethniu, or from any other prisoners in the Well?
Harry had a binder of supernatural sources... summoned a Loa who seemed to have an inside track even on Angelic-level sources!
Any other way(s) for him to learn about Nemesis (and/or more about the Starborn thing)?