It was just a command block that was coded to answer any question. But then it was corrupted by the Goo. Now it teleports into attics and basements with a note that says it will answer any question. Be wary, as asking certain questions or asking too many, tends to make the was asking the questions disappear. It is also said to take a block from each house it visits. It is rumored to have a dismembered head in the shulker box.