z_The 10 Taken
Elite (and pricey) assasin’s guild. Their emblem is that of a sun made of shadow. It’s members tend towards that of rogues, but mages aren’t unknown…
The party knows that they are working with Soulcatcher to some extent, and appear to be taking orders from Nightcrawler.
On a more surprising note, the main headquarters is directly under the Gotham mage tower.