That was probably some fonts Amazon's FT lib choked on, which in turn after a reboot crashes X, which in turn, after a while, stops the boot process/shutdowns to the 'YKNR' screen.
[Cf. what happened to a
Fonts Hack user recently].
(FWIW, that's why I recommend manually checking that everything works fine after an X restart when adding new fonts, makes it easier to recover).
[As for the verbose eips print, completely normal, that's the last thing the USBNet hack does when WiFi is enabled, and since X never started, there wasn't a full screen refresh to 'erase' it].
Now, if you're in WiFi only (meaning it never switches to usbnet, stays in usbms), and you killed /var/local, yep, you're screwed on the WiFi front, catch-22. So, unless you can get access to the userstore to either disable the wifi only mode, or activate the rescue pack, it smells like serial time ;/.