From Destinypedia, the Destiny wiki
Barrier Hobgoblins are elite Hobgoblin units belonging to the Vex armed with enhanced Barrier tech. When enough damage prompts the unit to, the Hobgoblin will envelop itself in a dome-shield while regenerating (as is custom among Hobgoblins) and suppressing enemies with its weapon while doing so. To prevent the Vex unit from regenerating and staggering it for better damage, a Guardian should use Anti-Barrier Rounds to penetrate the shield and stagger the unit while providing a window for damage for everyone.
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