Rockseekers seem to be nowhere in sight. Tharden's body was retrieved from the grotto around the same time that Mista gets on the vengeance quest for one Mr. Hornbelly.

You can ask around the dwarves on Maru and they'll tell you that they're probably somewhere deep in the mines.

Corroborate that information with the rest of the Reclaimers and, hell, maybe even gerblins, and you figure out that almost every inch of those mines seem to have been explored at this point.

You're missing something.

Something's not adding up.

People have been to the bottom of the lake, explored the grotto, wrestled bears, got lost in the wave echo cave, and yet... no sign of them except for their dead brother.

Which is troublesome.

Only one place left to look, really. The Whomping Willow.