Data Crystals are First Ones' tech that are found in the Crystal Castle that houses Light Hope and all through Etheria. We first see them in "The Sword: Part 2". In "Promise" Catra steals one from the building and gives it to Entrapta, who later uses the crystal to power the Fright Zone weaponry and Hordak's armor.
We're Getting Mutants in the MCU - The Loop
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