Basically, my original problem was that whenever I tried to boot I would get
error: file ‘/boot/vmlinuz-5.15-X86-64’ not found you need to load the kernel first.
In the course of trying to fix this it appears I have broken it further to where in the Manjaro boot screen I do not even have to option to attempt to use a kernel, it displays only my Windows 10 drive and the Memory Tester (along with the grub command line and boot settings). I followed instructions mostly from this thread. I have tried to use pacman -Syu to see if that would fix anything but it prompts me with a thousand “replace x with y? y/n” (package and package5, usually) and no matter what I do I end up with unresolvable package conflicts and no transaction happening.
Usually, I would just move on and reinstall, but there are a few important files I need.