Okay, so I apologize for how rough this is going to be, but I'm trying to troubleshoot this from my phone, rather than my desktop. I recently did a system upgrade (pacman -Syu), which looked fine, but now my poor desktop is booting into "emergency mode". It gives me a list of things during the boot attempt, two of which appear to be of interest:
[FAILED] Failed to start Load Kernel Modules, and
[FAILED] Failed to mount /boot/efi
Now I have a bit of a theory, which may or may not be a crap theory, but after some digging, I suspect that whatever module is used to load FAT-32 filesystems is failing to load, and thus my efi partition is nopeing out. I'm unsure of how to fix this, however.
Edit: I have also noticed that, even though I have kernel package 4.9.77 installed, uname -r tells me my actual kernel version number is 4.9.74. Could this discrepancy be causing the issue?