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A sweeper is a weapon used by various spelljamming ships. An experimental weapon designed by gnomes, it consists of a pair of light ballistas with a common mount so that they can be fired in the same direction at the same time. The two bolts are linked with a heavy chain, which is intended to be used as an antipersonnel weapon against enemy crews.
Early versions of the sweepers used chains long and thin enough to capture a couple of small sized opponents, but the gnomes soon worked out the bugs to the point that they could use them against human opponents. The other problem with the sweepers remains uncorrected — when the chain strikes something heavy, like a mast, weapon turret, or other piece of deck furniture, the chain tangles and is useless.