Hello! I'm confused and I didn't know where else to put this, so hopefully this is fine.

I'm leveling my gatherers, and my friend said I would need the Tomes of Regional Folklore.

Would I need 1 tome for each region AND 1 for each gathering class (3 in total)? Are they a one-time use?
Now that there is SB out, would I need to do the same thing again?

Any other useful information would be helpful. Thanks!