Ritual Chamber
By building and maintaining a reusable chamber for summoning marines, we can reuse some of the materials needed to bring them forth from the warp, thus reducing the costs to summon them.
Probably more of a design...
Controlled Ritual
We focus the chaotic energies away from the warp-catalysts, increasing the likelihood that they will survive to be reused. Hopefully reducing the material costs of summoning marines.
Improvised Ritual
By incorporating scavenged materials into a summoning ritual, cultists can be converted into marines while in the field, rather than produced from our home base.
Is this already a thing? The marine summoning ritual is kind of vague about its limitations or why it consumes materials when the marine brings their own gear.
Militia
By giving cultists some basic training, we can get them to do amazing things, like looking down a gun's sights, taking cover when someone shoots at them, atempt suppressing fire and covering their allies, spread out their fire against things that don't require concentrated fire to bring down, recognise the difference between soft and hard cover and recognise theat prety much everything is the former so don't stay in one place, and generally behave vaguely like soldiers with hints of competence and a survival agenda rather than a clueless gang of hooting thugs looking to prove themselves.
Some ideas for revisions to existing gear that we will probably be using for a fair while.