The Star Stone

The Star Stone appears as a slightly luminous, blue-white diamond, roughly cut into a small sphere. At all times it sparkles with slow and harmless lightning and blue vapour coalesces around it. Left undisturbed, this vapour will eventually form into several galaxies and nebulas around the Star Stone.
When not attuned, the Star Stone is said to be as heavy as a star and even almost no creature or person in the world can move it. When attuned, the Star Stone weights a little less than a pound.
== Attunement ==
To attune with the Star Stone, one must star gaze alone within 5 ft of the Star Stone. The attuned must be alone and awake for the entire night, pondering the stars. If the stars are for any reason blocked, such as when a large cloud passes over the sky, attunement fails and must be reattempted.
== Abilities ==
When attuned to the Star Stone, one can conjure, from the surrounding vapour, a map of the plains and space. This map is only comprehensible to the one attuned with the stone. With this map, teleportations to other planes can be planned.
It is thought to be one of the few ways to safely travel between planes since Stormfall.
Alternatively, the one attuned to the Star Stone can focus its energy to open a portal. The portal remains open for one minute, or until it is dismissed by the one who created it. The portal is one way and can connect to any location on the same plane, given suitable description of the goal. It can also allow for interplanar travel but can only connect to planes the attuned one has personally been to. When used this way, the Star Stone crumbles into glowing fragments and dissolves into nothingness. The Star Stone then returns as a small meteoroid, landing somewhere over Ferra.