Continuing from what Wesaelan Brookshadow has found, my journey appears to be spiraling towards a confrontation with the Bloodsabers. Though the story I've managed to piece together thus-far has been largely incomplete.
Shareable (Complete)
I must raid the meeting of Riason Hanagom and the Bloodsabers out at the old mill of Windstalker Pond in Antonica.
Raid the Bloodsaber meeting and kill Riason Hanagom. (in Antonica)
I must return to Captain Eitoa at the Qeynos Gates with the letter I found.
Speak to Captain Eitoa. (in Antonica)
I must take the encoded message to the mages at Three Towers in Qeynos to find someone to read it.
Find a scholar. (in Qeynos Capitol District)
I must return to Captain Eitoa at the Qeynos Gates in Antonica with the text that Rune Shimmerstar deciphered.
Speak to Captain Eitoa. (in Antonica)
I must stop the courier from meeting with the Dark Coven along the southern road in Antonica.
Slay a Bloodsaber courier. (in Antonica)
I must return to Captain Eitoa at the Qeynos Gates and tell her of the messenger's success.
Quest Rewards above are only the guaranteed XP, faction, and coin rewarded for this quest. Status points and rewards limited by class, race, alignment, etc. are unavailable.