I can’t notice anything suspicious in the log part.
Was it the complete log from the previous boot?
What utility do you use for updating your system? The proper update command is pacman -Syu, not pacman -Sy <package list>, even if it may not have to do with the current problem.
There are a couple of issues on Archlinux packaging currently, that may have hit you (and maybe others), so some more investigation would be necessary from EnOS devs. (I mean a recent mkinitcpio change, that could potentially break some hooks)
This same thing happened to me yesterday with respect to grub2-theme-endeavouros although mine booted. It was during the update that it said the package was missing. So in the instructions in another post it said to remove it and edit grub config file to not load the theme. When i removed it then it booted with an error and if i pressed enter i had the black themed menu. So i edited the grub file and then it only booted to firmware. I lost my dual boot windows but could get into Windows with F8 key. I had btrfs setup and i got annoyed and just reinstalled because i didn’t have the time to go through it. This was a bit quicker and easier to resolve. I’m just wondering what’s up with this grub2-theme-endeavouros package and grub?
i really need to move some important data to an external hard drive. i can’t imagine not having access to it and my super important data would no longer be available.