The goblin village sphere is used in the quest Another Slice of H.A.M.. It teleports the user to the Goblin Village. It can be purchased in the city of Dorgesh-Kaan from Oldak for 2 law runes and a piece of molten glass.
Unlike most other forms of teleportation, spheres do not teleport players to one set point; instead they place one in various locations of the area they are aligned to. (This can cause some confusion for players not familiar with the place's layout.)