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Planar Adventures / Building a Planar Campaign / Planar Tuning Forks

Common Tuning Fork

Source Planar Adventures pg. 85
A common tuning fork is one attuned to the major Inner or Outer Planes (Abbadon, Abyss, the Astral Plane, Axis, the Boneyard, Elysium, the Ethereal Plane, the First World, Heaven, Hell, Maelstrom, the Negative Energy Plane, Nirvana, the Plane of Air, the Plane of Earth, the Plane of Fire, the Plane of Water, the Positive Energy Plane, and the Shadow Plane). For layered planes, a common tuning fork can be attuned only to the first layer of the plane (the Threshold in Heaven, Avernus in Hell, or Kurnugia in the Abyss). Attuning a common tuning fork requires striking it against a solid surface somewhere on the plane, after which the tuning fork must be allowed to absorb the plane’s energies for 24 hours. Once this time passes, the untuned fork becomes attuned to that plane.