Ascension of Isaiah

In The Ascension of Isaiah, Belial is the angel of lawlessness and "the ruler of this world."

And Manasseh turned aside his heart to serve Beliar; for the angel of lawlessness, who is the ruler of this world, is Beliar, whose name is Matanbuchus.

—^[28]

In the Rules of the Community God is found making a very prolific statement, "I shall not comfort the oppressed until their path is perfect. I shall not retain Belial within my heart."
The War Scroll and the Thanksgiving hymns both delve into the idea that Belial is accursed by God and his people, and shows how the existence of Belial in this world can be attributed to the mysteries of God since we can not know why he permits the dealings of Belial to persist.
In the Dead Sea Scrolls Belial is further contrasted with God. These are the Angel of Light and the Angel of Darkness. The Manual of Discipline identifies the Angel of Light as God himself. The Angel of Darkness is identified in the same scroll as Belial.
Also in The Dead Sea Scrolls is a recounting of a dream of Amram, the father of Moses, who finds two 'watchers' contesting over him. One is Belial who is described as the King of Evil and Prince of Darkness.