That's not the whole cartridge. This is how the rifle bullet looks like. Notice how it's tapered at the bottom, that's the part that sits inside the casing
A bit off-topic but I just remembered that there is real mental disorder that makes it hard to recognise visual elements, like faces for instance. Person has no problem remembering things but it's very hard to recognise. I think I read about a man who couldn't percieve a diference between his...
@Tearsax and that was more than a thousand years ago. Also don't forget about the elven genocide that demons were doing. I'd imagine specifically the elves that lived in settlements died first, as they are just sitting targets for demons. Hence why the only two elves we've seen so far are strong...
A small detail that I noticed, but the reactor design on 18th page looks exactly like a air-dryer reactor of his magical tool. Could they use magical energy to power their communication device?