!!!warning: potential spoilers!!!
What follows is speculation into the story of the recent patch so obviously some spoilers are going to be unavoidable ahead.
!!!warning: potential spoilers!!!
So here is basically my break down of what I think has occurred so far…
In the previous patch we saw Aerin, a rather over excited and eccentric (read as relatively normal) Sylvari join the Zephyrites. Also notable is that Taimi mentions getting absurd readings from one of the airships.
The Zypherites are sabotaged by Aerin and Aerin… A seemingly normal Sylvari goes full on psycho mode… Not unlike a certain red topped Sylvari we once knew.
Based on the texts in Maguuma, I believe the Zypherites were holding Glint’s baby dragon in the air ship that the introduction cutscene made a point of zooming into when you entered the festival. It’s probably the one you protected in Guild Wars 1, if you did that mini game.
Aerin, a seemingly normal Sylvari learns of this secret… He’s clearly overly curious and eager to learn everything as he joins the Zypherites. And yet the Zypherites describe him as soundless… A trait that he does not seem to possess when we first meet him. Poorly thought out characterisation? Unlikely… It seems quite dilberate.
So here is my chain of events:
Aerin joins the Zypherites.
The Zypherites set off on their journey.
Somewhere along the way Aerin learns of the baby dragon.
The closer the Zypherites got to Maguuma the more likely that Aerin seemed to act soundless.
The soundless appearance is actually Mordremoth’s influence slowly asserting itself over Aerin.
He then goes on the killing spree that follows in an attempt to destroy the baby dragon for Mordremoth.
Finally it would make sense that Mordremoth would have a vested interest in cutting a Sylvari off from the Pale Tree’s dream. As it would be the only outside influence that could possible stop him from asserting his will over a sylvari. Thus making them appear soundless, because they technically are to some degree.
It would seem that even when a Sylvari is being controlled by Mordremoth they retain some will power. Mordremoth seems to get round this by convincing them that what they are doing is right and justified.