I vote storm grenade, it does very good damage and has a wide radius, also, with a particular stormcaller perk on the skill tree it allows it to one shot a guardian if the lightning chains.
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#Destiny
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Suppression grenade Physics are similar to the incendiary grenade. Currently only Titans have access to this grenade. It's pretty much like a shadow shot grenade with out the armor debuff, it'll take away all your abilities, but it won't slow you down unfortunately.