Mysterious Noises is a quest in Xenoblade Chronicles. It can be received from Prox in the Hidden Machina Village on the Fallen Arm. If Shulk is in the active party, he will comment.
"You found the cause of the noise and reassured Prox. Now she can return to her water fetching."
- After completion of this quest, the Affinity Chart will change if Prox is spoken to again between 21:00 and 00:00 or at 03:00 when she is leaving: