From their website:
Discordia, the favored myrmidon of Adeptis Rahn, is arguably the pinnacle of Iosan warjack technology. Capable of projecting a wall of force energy around friendly forces or focusing that energy into a concentrated wave to shatter all opposition in its path, Discordia is a singular symbol of House Shyeel’s—if
not the Retribution’s—might.
*Players will need a Retribution of Scyrah Heavy Plastic Warjack kit (PIP 35007) in addition to the upgrade kit in order to build Discordia.