Then Sunsinger subclass has an ability that grants you a second nade. Sunsinger's super can greatly reduce the cooldown rates. You can basically make it rain nades for a bit. Also, self rez and dmg reduction. And fire shield.
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Dont forget, the new warlock chest piece exotic gives you a third grenade if you are using sunsingers with fully upgraded grenades.
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Boom shaka-laka!