TL:DR: five more plasma specialists, ho!
Among the most recognisable arms of the Suzerainty are the Dneprius Pattern Plasma Carbines, relic-pattern weapons refined within the manufactoria of Khorsytsia Magna. Derived from ancient Solar Auxilia schemata recovered during the early years of settlement, the Dneprius pattern emphasises durability and thermal stability above all else. Reinforced plasma coil housings and external coolant reservoirs allow sustained fire in harsh frontier environments where lesser plasma weapons would risk catastrophic failure. During the long isolation of the Chornohur Vortex, surviving forge-clans further modified these weapons to withstand fluctuating atmospheric and void conditions, giving rise to the rugged forms still carried by Suzerainty troops today. Each carbine is ritually sanctified by Mechanicus enginseers before issue, and many examples remain in service for centuries, passed from veteran to heir as both weapon and symbol of duty.