Shriek

From Dragon Age Wiki

These stealthy assassins are vital for the initial push into the city. Able to pass undetected behind enemy lines, they’re charged with taking out the enemy’s key defensive positions in advance of the larger horde. Without a vanguard force to take advantage of the shrieks’ actions, however, their abilities are largely wasted.

Shriek Skills

Frenzy
The shriek strikes at its opponent four times in a frenzy, dealing normal damage each time.
Leap
The shriek leaps on its target, dealing normal damage and knocking the target down unless it passes a physical resistance check.
Terrorize
The shriek shrieks, dealing spirit damage to nearby enemies and stunning them unless they pass a physical resistance check. Werewolves caught within the shriek are enraged, gaining a bonus to damage for a short time.
Overwhelm
The shriek leaps upon its target, pinning it to the ground and attacking it repeatedly.