"Ah?"
Ye Mingqiu scratched his head, feeling very puzzled. He really got it from defeating monsters, and it was when he opened a bunch of treasure chests all at once that he found it.
Tang Ruobing stared at him, feeling that Ye Mingqiu didn't seem to be lying. So she sighed and explained: "This is an advancement item specifically for the Child of the World. Typically, it's found on the final Boss of the Child of the World quest. You can only get it by defeating the Boss and either finding it on him or opening it from a treasure chest. It doesn't drop from just monsters."
"But... it might be that the monster you defeated happened to be carrying the item for transport, and you managed to intercept it..."
"Wait, aren't you doing the Save the World quest? How did you clear it if the Child of the World didn't get the key advancement item? The difficulty of an emergency summon is higher than normal; how did you complete the main storyline without a fully developed Child of the World?"
