The Assassin Organization is a group of mercenaries led by an individual known only as Mother. The organization has operated missions in all four countries, though it's not known where the organization is based.
The organization operates by receiving requests from clients, such as assassinations, and tasks members to fulfill said jobs. So far, members of the organization have committed murder, assassinations, attempted to steal an insignia, and caused a Demon Beast incident within Roswaal's territory for an unknown purpose.
Mother's identity is apparently a secret, as Meili didn't know what the former looked like, however, when Elsa was first approached by Mother, she took the form of a Black Dragon then morphed into a small girl with gold-coloured hair and scarlet-red eyes. Mother also doesn't tolerate failure, as Meili stated she would be disposed of if she returned or was found by the organization. If one does not fulfil their task, she will punish them, as seen when she prunned Reisel after he failed her and was defeated by Ricardo Welkin.
- Elsa Granhiert (deceased)
- Meili Portroute (defected)
- Reisel (unknown)
- Sithonia Featherrun (deceased)
- It's been heavily hinted that Roy Alphard is a member of the Organisation, working as another one of Mother's children.