Mami's muskets have hammers which do this, although those hammers seem to be tipped with some sort of crystal (unless they're just glowing hot when summoned). More modern weapons use a firing pin that hits a primer on the back of the cartridge.
. Even for a griefy autoloader we may have to ask Mami to bag her powder before handing it off to us, or we might have her continuously filling a hopper that we manage using Grief.
A shell casing is mechanically very simple, basically just a cylinder that's open at one end with a small hole in the other for the primer, so it should be well within Mami's ability to visualize and make. The tricky part is the chemicals used in the primer, and Mami might be able to replace those with whatever magical spark-generating crystal she uses on the hammers of her muskets (if that's really a thing) or by having her detcord ribbon extend through the hole where a primer would be.
We could also make each "loop" in the ammo-belt (if this is going to be belt fed) solid and closed at the end and essentially act as a shell casing that Mami just fills with propellant and shot.
Although while I was asleep it seems people moved ahead to wanting to make it a railgun? I kinda feel like we might want to save that. This is supposed to be our tandem attack with Mami, and with a railgun she'd basically just be making the projectile while we did everything else. We could probably do the railgun entirely without her if we used scrap metal instead.
The thing is, we don't actually know how Tiro Finale works or what's keeping her from making it automatic on her own.
Well, we know why she can't make fully-automatic weapons, or any weapon more advanced then a musket. It's got too many moving parts for her to fully comprehend and visualize while creating out of thin air.
Regarding Prima Luce: Isn't the obvious answer a pseudo-transparent barrier that is part of the attack? One programmed to absorb only damaging frequencies of light.
It's not the frequency that's damaging, but the intensity. But this does give me an idea.
What we could do is abuse our grief powers and knowledge of science fiction to create transparisteel with
phototropic shielding from Star Wars. That was how starfighter canopies could be transparent to visible light, but still protect against lasers by darkening in response to anything intense enough to be dangerous. As we've demonstrated before, our grief constructs can recreate scifi stuff no matter how nonsensical the science involved is (because it's actually magic), so we should be able to make a shield like this. It'll just feel witchy.
'Maybe a... slider?'
"No clue what's going through her head, really- oh she's doing something."
*Waves shield around Sabrina's head*
"What's that supposed to do?"
I'm wondering that myself. How is waving her shield around supposed to determine if Sabrina is a slider? Or is she checking for wires in case Sabrina is a puppet?
... I really, truly hope this was asked in a "let's hide the evidence!" manner, and not as per the D&D adventurer mindset of "you never know when you'll need a corpse/[insert horrendous object here]!"
The portable hole full of bodaks was not one of my gaming group's better ideas, no.
