Hey, maybe you're still around and see this comment. Where did you find the 0Y00 key?. I got the other 3 and yes, 00#0 requires access to the valley of styx and some air walking in the backstage, A000 needs a hint from a NPC you have spoken to and probably forgot for it to show up at all. I'm pretty hard stuck right now trying to find 00#0 to see if that lets me progress somewhere at all. I thought it would be deep in the crypt, but the guard keeps saying I need high bishop permission.