Discuss Nier as well as the comments posted to our Nier Replicant Wiki and Nier Automata Wiki
By Anonymous
You need to listen to your fortune to be able to find the Iron Pipe. It's in the location where Yonah was at the beginning of the game.
By Anonymous
Speak to the Fortune-teller to revisit Nier's dream any time after the quest is complete (that means, even in subsequent playthroughs). She will only show up once all five key fragments have been acquired, however.

The shades in the Fortune-teller's dream are a good source of rare material.