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The following section contains information from StarCraft: Retribution.
The Argus stone was an incredibly powerful xel'naga artifact found in the ruins of Taledon, located on the world of Aridas. Protoss, Terran Dominion and zerg forces all arrived at Aridas hoping to obtain the stone and use it for their own purposes.
Kizrath's forces located the ruins of Taledon, but the Aridian terrans had also converged on its location. Kizrath defeated the Aridians and destroyed the old temple sheltering it, retrieving the stone.
The protoss government considered the stone's tactical value to be low. Kizrath and the stone were left stranded on Aiur, with orders to continue to fight the zerg.
The protoss took the stone to the "far side" of Aridas, protecting it with many troops, while using a temple warped from Aiur in order to focus the stone's energies. However, Dominion forces led by scientist Jenson Archimedes defeated the protoss, destroying the temple and stealing away the stone.
The zerg discovered the location the Dominion was using to hide the stone, inside a science facility, and attacked it. With the aid of powerful defiler Thakras, the stone was obtained by the zerg. The zerg immediately brought the stone back to Char, fending off protoss and terran attacks as they did so. Finally the zerg used the Argus stone to create the Supreme Being.