Blame The Goth Girl Vol. 7: Greater Love Has No One Than This: To Lay Down In The Fields Of The Nephilim

Upon learning of Rome's true role in the society, the fall out in the supernatural world begins. Tensions grow to insurmountable levels when Sabine decides to make her play for Esben, leaving Onyx to make an impulsive choice that affects everyone around her.
Feeling Esben hasn't fulfilled his duties as Onyx's master, Rome takes over the role pushing Onyx even further away.
On the spiritual side of things, more is revealed about the Tutorea's past and why the ancient Magus coven went to great lengths to hide the truth from everyone.