When one grenade just won't cut it. This thing is basically Armageddon in the palm of your hand.
~ Item Description
The Cluster Grenade is an unlockable Throwable for the Gunner. It is a handheld explosive with multiple payloads connected to one large stick. It seems similar to bundled versions of the real-life German Stielhandgranate (stick hand grenade), otherwise known as the "potato-masher" grenade, used in the World Wars.
The Cluster Grenade does not produce an explosion upon landing. It will instead eject its nine miniature payloads after a brief delay upon impact with the world. These "bomblets" will eject in random directions (though the distance they travel remains roughly the same) and will immediately explode on impact. The combined damage of all these bombs stacks up to 360 damage.
They have a chance of stunning their target as well.