The Antivan Hounds
The Antivan Hounds are a rival guild of the White Owls. They were formed by a group of five deserted templars. Therefore, their assassins are a bit inferior to other antivan assassin guilds, because the Antivan Hounds miss some secrets of the art of assassination. But on the other hand, their man know all the tricks to hunt down a person and some of the magic defying abilities of the templars. Because of that, they are often hired for abduction in general and especially, if the target is a mage.
Aditionally, even though the leaders are traitors of the church, they still have some few connections to the templars and the chantry.
The guild itself is quite young with a history of 15 years and extended their actions to Ferelden just a year ago and they are still trying to secure their position against other guilds like the White Owls.