Automated Personnel Unit using chromodynamic energy as a weapon
Chromodynamic energy was a type of energy encountered in the power source of Pralor Automated Personnel Units, which was a technology completely unfamiliar to Starfleet as of 2370. Its energy system was incompatible with EPS power conduits. (VOY: "Prototype")
Automated Personnel Units could also release a beam of chromodynamic energy from their hands as an offensive weapon against humanoids. (VOY: "Prototype")