Uraj


 * Kerrigan: "Explain something to me, Zeratul. Why would your people leave such a sacred crystal in the hands of these Terrans?"


 * Zeratul: "We didn't. Long ago, this world was a Protoss colony called Khyrador. When the strife between our tribes escalated, this planet and the Uraj Crystal were abandoned. These Terrans have come here only recently."src

Uraj is the name of a powerful Khaydarin Crystal. It is violet in color and possesses the energy of the Khala. It is a twin of sorts to the Khalis crystal.

Backstory
The Uraj crystal was created by the Xel'Naga, one of two shards carved from a monolithic Khaydarin Crystal. Uraj was entrusted to the Akilae Tribe and venerated as a sacred relic. Originally similar to its counterpart Khalis, their respective enviroments caused the two shards to distinguish themselves from each other. After the Xel'Naga departed Aiur, the Protoss turned on one another, the Akilae hiding the crystal until the Aeon of Strife came to an end. For a time the Templar caste kept watch over the Uraj and used it in their meditations. When the Protoss first began exploring space again, they triumphantly carried the Uraj with them to one of the first colony worlds, Khyrador, and installed it in a place of honor in the colony. Later, mysterious and violent psionic storms broke out on Aiur and its colonies, including Khyrador. Protoss on Khyrador hastily fled the planet and returned to Aiur, leaving many treasured items behind, including the Uraj.

The Quest for Uraj
During StarCraft Episode IV, Shakuras, homeworld of the Dark Templar, was overrun with Zerg. In order to cleanse this infestation, the Xel'Naga Temple on the planet needed to be activated, but it required two crystals, the Uraj and the Khalis, to do so. Raszagal ordered her Protoss warriors to let nothing stand in their way in order to acquire the crystals.

Artanis, Zeratul and Infested Kerrigan led the Protoss forces to Braxis in order to retrieve the crystal. Kerrigan personally led the forces to the crystal, defeating the Terran Dominion forces which stood in her way.

On Shakuras Artanis, as follower of the Khala, carried the Uraj to the Xel'Naga Temple in order to activate it. He was successful, and the Zerg were obliterated.