A player using a sphere to teleport.
The Plain of mud sphere is obtained during and after the Land of the Goblins quest from Oldak for 2 law runes and a piece of molten glass. It is used to teleport to the Plain of Mud which is in the Goblin cave just south-east of the Fishing Guild.
Trivia
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.)
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