Guild Wars 2

How much of the population do you all think did that half or a quarter or around that?

Given how sylvari hearing Mordremoth’s call is based on distance (underground in Tangled Depths it goes silent), I’d say not many in overall. We’re told the Nightmare Court makes up about 15% of the sylvari population, and I’m hesitant to argue the mordrem guard outnumber the Nightmare Court, as thus far we’ve only given indication that a large number of Pact sylvari fell to the call – there’s still several dozen who didn’t in the Pact alone. And with it being distant based, those in Brisban probably didn’t even hear the call – given that we have canon confirmation that the mordrem invasions of Brisban, Kessex, and Diessa is canon (from Canach’s dialogue in HoT’s tutorial), and the Priory scholar in Brisban remarked on the lack of studying mordrem at a sylvari outpost while expecting such.

I’d say it’s probably about 5% of the total population given what we’ve been shown. Hardly the “oh my gosh!” situation that ArenaNet hyped us up to. But to show such a situation, we would have needed to see Lion’s Arch in chaos as sylvari there turn (in a story instance only, of course).