I use my laptop every day and update according to the update manager - sometimes using yaourt or pacman directly if there are any niggles.
On Saturday, I dutifully allowed the updates to happen which included an update of the Linux Kernel. I did a restart and found the machine wouldn’t get past the kernel version screen, just before I unlock the encrypted volume.
I am able to run the fallback option (which is “Linux artemis 4.18.6-arch1-1-ARCH #1 SMP PREEMPT Wed Sep 5 11:54:09 UTC 2018 x86_64 GNU/Linux”)
Looking in the /boot folder, I noticed that the fallback img is around 37MB while the newly installed img is about half of that at around 17MB
I will pop back in and edit the post with some more details from the error.