The Cosmokey.
The Cosmokey is an artifact used by Spectrobe Masters in the Kaio system, in conjunction with the Cosmolink. The Cosmokey looks like a pentagon, with five colors representing the five properties of Spectrobes and Krawl in the Kaio system.
Rallen and Jeena are given this item by Kamtoga after they find him on the ice planet Kogoeria. After obtaining this device they can open up the Stone Markers found across the system to receive Legendary Weapons.
The Cosmokey should not be confused with the Cosmolink, the device that Spectrobe Masters use to store items, weapons, and Spectrobes.
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Game screenshot