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D-4 is the name for a Zio Matrix made bipedal MT that appears in Armored Core 2: Another Age.


The D-4 is a manned bipedal MT, around the size of an AC. It was developed from the D-1 and D-2 units and marks the completion of the D-Series. The units armaments are identical to the D-2 a plasma rifle mounted on the right arm and a dual vertical missile launcher mounted on the left shoulder. Visually it also looks identical to the D-2 although durability and boosting capabilities seem to be enhanced.


  • Plasma Rifle
  • Dual Vertical Missile Launcher


Appears only in the mission Prevent Prototype MT Theft as an enemy. The unit is made by Zio Matrix and stolen by Balena.