Azlo - Primarch of Subjugation

"Sometimes I'll allow one or two to escape. Perhaps they believed the Ancients answered their prayers, or that a stroke of luck allowed the manacles to slip off. I allow them to build hope as they desparately attempt to escape my domain. It makes their eventual recapture all the sweeter."

Azlo is one of The Primarchs, a powerful member of the Infernals known for his penchant for imprisonment and captivity.
Azlo rules over the Ashfell region of Arreat, a barren and scorching wasteland, filled with harsh crags that have been hollowed out to function as prison complexes. Azlo is usually depicted wearing an iron mask while carrying an immense amount of chains.
While regarded as one of the weaker Primarchs, Azlo is infamous for his cruelty and sadistic nature both towards mortals and his own kind. Azlo's forces rarely kill an enemy; rather, they drag them back to Arreat to be imprisoned and chained within its depths. Here, the unfortunate denizens are put through cruel "games" designed to break their will, or simply tortured physically. Azlo seeks to grow his "collection" of creatures, ultimately desiring for all of Ashfell and beyond to be subjugated by him.