This would qualify as tier 1 since it's a quest idea we attached to a log and the outcomes are cumulatively supported by information we've already dispensed. The additional info you requested is below:

The moles' homes are indeed near enough to the rat warrens that one could reasonably conclude that the very disruptive heroics by the Hatchlings could have rattled them. Sorry, friends. Humans — and especially superhumans — aren't a part of Ethyraia's ecosystem! Your actions here are having an impact on the local wildlife.

Additionally, in a surprising and perhaps disgusting turn of events, they might notice rat carcasses around the moles' homes, in states of decay suggesting that the moles in fact feed on the rats.