Dumchik is a Domovoi, a type of Fey called the House Spirits, protecting Greenside Farmstead. He lives in 'Ma' and Murom the Reaper's house, and was first encountered during Trouble at the Farmstead.
During Shadows of Greenside, he was kidnapped by the invading Shadow forces, but the visiting party saved him, though he ended up fused to a twisted tree in the Millennium Forest, and his fate remains unknown.