Nethersight Mastiffs are hounds the size of horses that serve as guard dogs in many cold regions of the world. They are attuned to the spirit world, and capable of biting an ethereal being and wrenching it fully into the mortal world. This ability makes them very valuable in guarding supernatural places.
Nethersight mastiffs fight like wolves, grabbing their prey and dragging it to the ground, often in a pack formation. They are able to see into and attack into the Ethereal Plane, and are capable of grabbing and wrenching an ethereal creature into the material world, making them easy victims for the packmates.