The Healing Beam is derived from rejected Zoltan technology bought on Slug black market. Developed for use on hospital ships; the healing beam uses a low power pulsed laser to pump a rider beam of medical nanites to a target ship.
It's healing effects can restore 50% of a human or similar crewman's durability, but it was rejected from Zoltan service due to it's significant fire risk.
The Khadarin Confederacy, of course, don't mind the fires. In fact, the Rockmen serving in Marauder Assault teams love the 'unfortunate' side effect, and have tuned this device to further increase it's fire chance.
Did that thing actually work ingame? I thought somebody said that only bomb weapons could heal crew.