The requirement to wear the stupid mask breaks any build, that uses any kind of ([i]exotic[/i]) helmet. Like the [i]Voidwalker+Nezarecs's Sin[/i]-Build.
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You can put one of 3 different mods on the mask that are all awesome. Way better than any exotic helm perk or build. I like the one that increase damage to all enemies and makes you invincible while in the air. You melt everything with that mod. Plus every mod makes heavy ammo drop constantly. It's impossible to run out of heavy ammo.