Whose sin brought on the Flood?

In the Book of Enoch and Jubilees the Flood answers the corruption that followed when angels took human wives and giants were born. The newer books in the archive move the blame.

The Cave of Treasures has no fallen angels. The children of Seth leave the holy mountain for the camp of the children of Cain, and the Flood drowns them as they beg at the door of the Ark. The Ark, piloted by an angel, traces a cross on the waters before it comes to rest.

The Kebra Nagast, in its first telling, names the children of Cain alone: they never prayed, sang lewd songs, worked uncleanness and bred the mule against God's command, and Noah warns his children not to mingle with them. Later the same book also tells of angels who came down to the daughters of Cain and were bound in Sheol.

The Testament of Naphtali keeps the older view in one line: the Watchers changed the order of their nature, and the Lord cursed them at the Flood.