They Who Are Many

What the Heroes Know

There are four species involved:

Those that were being drained on Ena
Hounds who are bred to die and are able to move between dimensions
The "red skins" who are like an army, control the Hounds and initiated the process on Ena.
Those that are the grafted abominations like Abatu, used as weapons by the "red skins"

Hounds

slave race to the "red skins"
they die alteast once, though maybe more
they seek out new dimensions for the "red skins" and once they have enough of them they can perform a ritual to summon a witch.
they possess corpses of the dead in order to perform the ritual

Witches

Can do some mind control

Factions

Two factions exist: Bane of Life and Web of Lies

Banners

The banners have 8 dots, connected by lines and sit on a red/white field, vertically divided. The dots are connected in a rough "m" shape. There seems to be two parts to the glyph.