What does Errand Boy allow, and which region's discard pile gets the discards?

Question

Accepted Answer

It lets you search from a different region's discard pile, not a supply-free search. You place one favor on Errand Boy to pay, so it cannot be used again until that favor is removed. Discards go to the region of your pawn, even when you drew from another region.

Oath: Chronicles of Empire & Exile

What does Errand Boy allow, and which region's discard pile gets the discards?