Forza Esterna

 "We're not aligned with any faction. We are our own faction, our own family. So when you pick a fight with one of us, you start a war with all of us."

- Hakai explaining the purpose of Forza Esterna to Rias.

Forza Esterna is a group founded by Hakai Keiji that consists of various people from different origins. Many are noted to be highly powerful individuals and have the reputation of being the strongest independent group in the Supernatural World. Despite having different charateristics and beliefs, the members of the group care for one another and all are very loyal to Hakai. They are the main protagonists of Heir of Destruction.