Helm is super awesome. It was my first exotic armor piece and is still the only one I use. Only thing that makes the defender class somewhat balanced in pvp
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I still like using Defender in PvP even without it. Use armor of light and a shotgun (or even your fists) and you're nigh unstoppable in your bubble.
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I like to use my bubble offensively with my helm.
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My current (non-helm) strategy is to find the control point that a good portion of the enemy team is trying to take, drop a bubble in the middle of them all and slaughter them as they charge in one at a time.
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I like to use mine against blade dancers