There is no order or organization of shadows - they are self-taught elite rogues, masters of concealment and ambush. They strike from darkness, employing personal decoys and hallucinogenic poisons to distract enemies before sliding a dagger between their ribs.
This specialization is only available if you have the Dragon Age: Origins - Awakening expansion pack installed. It also requires a minimum character level of 20. After acquiring the specialization, the character will gain access to four new talents
and be granted +1 dexterity and a +5 attack bonus.
How to Unlock:
The specialization is made available by using the Manual: Shadow