A Massassi piece represented a specific form of crystal and functioned as an artifact originating from the ancient Ordu Aspectu. This group was a breakaway faction of the Jedi Order. These pieces, linked to the long-gone Massassi species, bore a striking resemblance in their structure to the Massassi temples located on the moon known as Yavin 4. Their purpose was to serve as keys for activation, both at the Great Temple situated within the Massassi Site on Yavin 4, and at the Ordu Aspectu's fortified space station base, referred to as the Citadel of Rur.