The destruction beam is a protoss technology developed by the Tal'darim from void rays they pilfered from the Khalai and Nerazim. Renamed as destroyers, they utilize bloodshard crystals, creating the unstable destruction beam that arcs from one target to another.
References[]
Blizzard Entertainment. StarCraft II: Legacy of the Void. (Activision Blizzard). PC. War council (in English). 2015.