Crystal jammer

Crystal Jammer is a weapon deployed by the Milites Empire that disables the enemy's Crystal, rendering the people and constructs it powers powerless. It is operated by the l'Cie of the White Tiger Crystal.

Story
When Milites Empire attacks the Dominion of Rubrum they deploy the Crystal Jammer that disables the Dominion's crystal-powered shields and renders its soldiers unable to use magic. Class Zero cadets are tasked with disabling the Crystal Jammer as they are immune to its effects due to drawing their power from their hearts rather than from the Vermilion Bird Crystal. Class Zero disable the Jammer and then face off against Qun'mi Tru'e, the White Tiger Crystal l'Cie who was operating the Jammer. They defeat her, and reclaim the territory the Milites Empire had taken. Afterward, the Crystal Jammer is inoperable for some time.