Cintainn Lore

In Fables
According to legends passed down and stories told within the Cintainn Hegemony, the Vir are created when a disgraced Iri dies because their soul cannot rest. Disgraced Iri are not permitted to be bound to home trees, so they find their own and bring new, twisted life to plant matter.

Children are told tales of the Vir in an attempt to keep them in line and to behave. "Don't wander too far out of the village or the Vir will find you." Much like other fairy tales, children eventually stop believing in the Vir. Though we now know the things that go bump in the night and steal misbehaving children are very real.

Hierarchy
The leadership structure of the Vir appears to be similar, if not identical, to that of the Cintainn. We have discovered the existence of Vir'Bren, both from the scout's notes and from meeting one in battle, and have heard mention of a Vir'Kal from a captive Vir. It is yet unknown whether the Vir adopted these ranks after their use by humans or whether humans got them from the Vir, but the nature of Vir as servants of the One Who Slumbers suggests the latter and some connection between the Cintainn and the Vir is undeniable either way.