Emissary

In the Darkspawn armies, the few most toughest and intelligent of the Darkspawn become alphas, the commanders and generals of the Darkspawn armies. Of these alphas, a few becomes Emissaries, the spellcasters of the Darkspawn with abilities similar to Blood Magic. However, these emissaries rarely appear outside of a Blight, when they appear to see to that the generals and commanders of the darkspawn armies serve the Archdemon's interests and not their own.

Trivia
According to David Gaider, the Emissaries are the only ones among the Darkspawn that have been known to possess the ability to speak and communicate to other species, though topics of discussion with non-darksapwn races are rather limited.