((Coming some day, possibly over the rainbow.))
Equipment and armor
Each HD-series support droid featured a lightsaber-resistant armored chassis, a store of bacta grenades, medpacs, kolto injectors, bandages, a small selection of slicing tools backed up by a basic slicer-support module, a military-grade blaster, and a retractable vibroknife. At least some droids additionally carried portable stealth generators and personal deflector shields.
HD-001-Prototype was the first fully-constructed HD-series support droid deemed by Lord Kaissen De'eva to be prepared for field-testing under strenuous combat conditions - namely, aiding a Sith lord and his apprentice in clearing out a collicoid nest on Balmorra. Unfortunately, the apprentice betrayed his master - but the droid proved capable enough to stabilize the wounded Sith lord and transport him to safety even while still being attacked by collicoids.
HD-001-Prototype was captured by Republic forces along with Lord Tremab De'eva, but a traitor among the Jedi arranged for Imperial forces to ambush the transport carrying the prototype support droid to a Republic lab. The droid was upgraded several times during the course of its service. Unlike several other HD-series support droids, there is no record of the prototype's destruction. It was last seen in Lord Kaissen De'eva's company.