No gods or monsters just man and what he brings
“You may not be clad in the blessed flak armour of the Imperial Guard. You may not bring the Emperor’s wrath through the barrel of the righteous Lasgun. What you lack in the Imperium’s most blessed weapons of war you replace with fervour and faith. No army forged can stand before the might of the Emperor’s judgement, wrought by our hands.”
Abbot Von Schteil at the Veneris quarry uprising
The Frateris Militia are the masses of the Imperial Cult’s most zealous faithful. They constitute the unofficial and generally ill-trained troops of the Adeptus Ministorum who fight in the interests of the Ecclesiarchy. Although most such mobs consist of no more than faithful Imperial citizens drawn from a broad walk of life, some “Brothers” have had military experience in the Imperial Guard or a Planetary Defence Force (PDF).
The Frateris Militia are charged with the protection of Ecclesiarchy property on Kyros, which given the wealth and reach of the church is broad. On Kyros this translates into a lightly armed and trained security force ubiquitous in most large Ecclesiarchy complexes. The Ecclesiarchy snaps up the trickle of returning Imperial Guard retires for the officers for the “Brothers” and Scholas Progenium trainers. This means the Ecclesiarchy has a core of veterans thought lacks the wargear of a real military force.