The titan sunbreaker class is way too powerful in crucible. Mayhem game modes are dominated by titans because of the highly increased armor and sheer force of that subclass. Either make it two hammers to kill in PvP or reduce armor.
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I'm a hunter (main) I think the health regen is the problem and a shadowshot can cancel it out while nova bombs and strikers can one shot/hit the sunbreaker. I use sunbreaker on my titan from time to time and it's a pretty cool super.