So, what do we know?
The Honored Matres have a 'bloodless' weapon they brought with them from the Scattering. Nothing of the sort that the hacks envisioned: It requires a Charge to be united with the Weapon in order for it to fire, resembling a hand-held black tube. They only possess 300 units.
The Ones of Many Faces used a weapon that turned HM into vegetables, forcing them back to the Old Empire. Plus their arsenal includes that list that Duncan stumbled upon: Disruptors, miniaturized Holtzmann generators, null-g seekers (any relation to those seeker machines in Leto II's shared vision with Siona?), animals (Futars, are OMF the same as Handlers?), explosives, bacterialogicals, energizers, etc.
Related to the HM discussion, this passage:
And the Ones of Many Faces, curse them through eternity, had caused the
disaster. Them and their Futars! The ease with which all but that handful of
The Weapon had been confiscated! Awesome powers. We must arm ourselves well
before we return to that battle. Dama is right.
I read this as stating that the OMF stole HM's Weapon from them, and that the HM fled with whatever they had left, contrary to the story presented in Hunters and Sadworms about HM stumbling into Omnius and stealing those ridiculous 'Devestators.' The penultimate sentence also leads me to think that the third book, if Frank envisioned a battle, might've been a preemptive strike against the OMF (BG could select individuals with Siona gene, creating an invisible-to-prescience attack force).