ARX-6 Halberd was developed based on the M6 Bushnell. It is one of the testbeds of the Lambda Driver.

Development belonged to the Whispered Mithril Agent Bani Morauta, responsible for the ARX series. ARX to earlier the ARX-6 was just a collection of test equipment that speaks only to the Lambda Driver. While this being the first to combine this equipment to produce a true Arm Slave.

The ARX-6 can measure up to the level of precision measuring devices to be considered "Supernatural". the first decent useage of Lambda Driver technology. Second-generation machines based on this machine suffered power shortages caused by the M6 and thus the third generation AS, the M9 Gernsback was determined the successor experimental model base. From here the ARX-7 Arbalest was developed.

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