I was able to get to a recovery mode, and it looked like my OS was gone. The whole partition was missing from my hard drive.
I have had some weird issues with this #System76 laptop since I bought it during the pandemic, but nothing this severe. I tried scanning for it, making sure it hasn't become unmounted somehow or something weird. It was just gone.
I ended up just wiping the whole disk and reinstalling another version of #linux. Thankfully, I backup all my stuff regularly and didn't have any critical files only on that drive, but I am now way more careful when I run my updates and upgrades.