"I am the Brood. Divulging in all the World's Food. What do you seek?"
Ruby brings the Brood to your attention in her first dialog with: "Oh... And I'd be careful with that statue over there. It looks like at night it might eat items you give it..."
When you talk to The Brood, you can choose whether you desire Wisdom or Riches. If you place items the Brood likes in its inventory you get a reward the next morning
The Brood can be found at the bottom of a clump of trees bottom-left of the Treehouse.