Andrew of Caesarea
According to some, the star that had fallen from heaven to earth, and to the Valley of Jehoshaphat appointed for judgment, should be understood as an angel of God sent for punishment. The pit of the abyss signifies Gehenna.
I think the star is an angel of God. By God's permission he will release from the abyss the condemned evil demons whom Christ, when He became incarnate, bound.
Thus, after doing what is theirs before the end, they will afterward be subjected to endless torments.