You can read the first chapter here: https://bigworldnetwork.com/site/series/ageofarchangels/s04e01/
The group of angels known as Watchers, chosen to observe the race of men, led to the creation of the race of Giants. Xandir, a Watcher and then destroying angel, is faced with many challenges as his time on Earth brings about new and unexpected threats to mankind, the world, and even his own people.
Xandir is giddy at the prospect of destroying a city the size and wickedness of Nineveh, when the city gets a last chance, and he is forced to work with the one man standing in his way. While he waits for verdict, Xandir investigates reports of a city that is far worse, where humans and demons openly turn debauchery into an art form.