The following centuries became the most difficult in angelic history.
Beneath the banner of a rebellious archangel, an underground liberation movement started to rise. Those hushed whispers passed beneath the censorship of Heaven had grown in volume, transforming into torn-down posters and the nervous headaches of a dozen higher angels. Lucifer's following was growing by the minute, but nobody could tell just how many hearts he had won over. Though the presence of the rebellion was strong, the rebels themselves were too well hidden, disguised as ordinary angels in the ranks.
In those days, there was a strong sense of anticipation hanging in the air. God had very abruptly become detached from Heavenly affairs as humanity was going through another religious reformation —this time, it was that whole situation with the messiah and whatnot. So nobody was quite strong enough to snuff out the rebellion. Heaven was at a crossroads, and nobody knew which path it would take.