So i some how managed to end up with a grub cmd after rebasing.
I have for a while been on bluefin-dx:stable but an appimage we run to verify that users have systems updated, started not showing the correct version.
So, as the support team from the software said they support silverblue i had to rebase to silverblue to verify if it reported corectly (it didnt)
Then i rebased back to bluefin-dx but changed to bluefin-dx:latest, no errors or warnings i rebooted, and sudden grub cmd.
I tried to use grub cmd to start bluefin again, i tested my targets were okay with dual boot install i have, but could not get it to agree with my password for encryption.
I have now booted up in my dual boot, arch install where i can mount the system with the luks password.
Do anyone have any idea of how i can fix my grub for my silverblue/bluefin boot ?
Thanks 
Update:
Since i could mount the volumes and the old arch install was to be nuked anyway, i nuked that and installed bluefin again.
I can atleast move what i need from the old partition, and might try to see if I can fix it atleast to learn some more about grub.