When found, Groundling Boo stays on the floor, and will roll around along the ground, trying to harm you. These aren't much of a threat, it can be pulled by the force of your Poltergiest3000/4000. It has 50 hp. It can be hard, as it moves fast. Use ice to freeze it, and take a break while it thaws. They will roll away from you, if you try to suck them up. Poison is very effective against these.