Final answer:
Sevro commands The Howlers, a skilled and loyal group of soldiers within the 'Red Rising' series known for their distinctive tactics and closeness to the rebellion's main characters.
Step-by-step explanation:
In Pierce Brown's "Red Rising" series, Sevro au Barca commands the group known as: b) The Howlers. The Howlers are a group of fiercely loyal and skilled warriors led by Sevro. They play a significant role throughout the series, especially in the first three books ("Red Rising," "Golden Son," and "Morning Star"). Sevro, often called Goblin due to his appearance, is the close friend and confidant of the series' protagonist, Darrow. The Howlers are known for their cunning, resourcefulness, and determination, making them a formidable force within the intricate political and social landscape depicted in the series.