The Demon of Secrets (Swain's demon)
It is said that the demon of secrets was a vastayan demon.That is confirmed by Swains taunt response to Rakan -Rakan:"You were given Vastayan blood, yet chose to be blind." -Swain:"The Vastaya blood is not in my veins.It is on my hands."
So things don't add up...How did a vastayan demon get under Noxus..We know that vastayah originate from Ionia. I think that as Darkwill sent more and more troops to take over Ionia they came across the Demon. Maybe they somehow captured it with the help of Leblanc (maybe she knows how to,because now we know that is a immortal sorcerer) The Black Rose especially Leblanc would like to use a never ending source of people's secrets.That would help them with their manipulation. There is absolutely no chance that there would be a Demon in Noxus that Leblanc wouldn't know about.
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