From Destinypedia, the Destiny wiki
Quantum Minotaurs are a more durable and powerful Elite variant of the Minotaur seen throughout Vex controlled space. They can be distinguished from their Minor counterparts by their more silvery frame.
Quantum Minotaurs are of a thicker chassis than their regular counterparts and have reinforced Void shields. They teleport faster and are armed with a Vex Laser Rifle that emits a continuous beam of Void energy which can tear a Guardian's shield apart in seconds. When further pressed, they will permanently enter a berserker rage mode, aggressively charging down its target and wildly firing its Laser Rifle, and will attempt to get close enough to land a high-damage melee attack. However, Void damage can be just as easily used against them, especially their shields.
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