My initial guess for the nature of the Messengers that Imbue the Hunters was that they were old Wraiths of great power or fragments of same that got across the Shroud after the start of the latest big Maelstrom.
- It all makes sense now. The reason the Messengers are so bent on getting the Hunters to fight the "Monsters" is revenge for the spirit-nuke and the whole Ravnos situation that created the Maelstrom in the first place, forcing the old Wraiths into a desperate fight for survival before Imbuing normal humans (the only group of people on the planet not involved with the whole mess).
- It Gets Worse. Hunters are slowly driven insane from the Hunt (when it does not kill them first). Which sounds alot like the survivors of the Ravnos Bloodline that all went insane upon Ravnos' death. Further Revenge or Irony on part of the Messengers?
The Imbued are servants, or at least creations, of the Weaver and Wyrm.
- In the Hunter Storyteller's Companion, we are told that the Creator's "Ministers" are the force behind the Messengers and the hunters. In Kindred of the East and its supplements, we are told that the Scarlet Queen/Phoenix and the Ebon Dragon, two of the August Personage of Jade's Ministers, are also behind the creation of the Kuei-jin as well. Meanwhile, in Mage: The Ascension and its supplement Dragons of the East, we are told that the three forces of Creation, their Triad, is the Tiger (the Wyld/Creator), the Scarlet Phoenix (the Weaver/Preserver), and the Ebon Dragon aka the Centipede (the Wyrm/Destroyer). Thus, the Hunters aren't a force for good; they are chosen by the Weaver and Wyrm to attack monsters (primarily, those monsters that those forces oppose, though they're willing to lose a few of their own for their own ends - the Wyrm for destruction of everything, the Weaver as part of its plan).